How the Dinosaurs Actually Went Extinct

Most people believe that an asteroid is what wiped out the dinosaurs-but the truth is, that's only half true! It turns out there was more than one disaster movie playing at the cineplex that was Earth 66 million years ago. Join Hank Green and find out the truth about what wiped out our beloved dinosaurs.
If you liked this video, check out more videos about natural history and paleontology on SciShow's sister channel, Eons: / eons
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Sources:
www.ucmp.berkeley.edu/diapsids...
news.nationalgeographic.com/ne...
www.sciencedaily.com/releases/...
web.mit.edu/nchat/www/research...
volcano.oregonstate.edu/vwdocs...
en.wikipedia.org/wiki/Marine_r...
www.bio.sdsu.edu/faculty/archi...
www.geol.umd.edu/~tholtz/G204/...
paleobiology.si.edu/geotime/ma...
studentresearch.wcp.muohio.edu...
geology.gsapubs.org/content/ea...
www.academia.edu/7040995/Rapi...

[@dylanhall6355]

“100% of the dinosaurs” Chicken: clucking intensifies

[@dylanhall6355]

@Anne O'Nymous Save it for the semantics dome, E.B. White!

[@christopherandrew2629]

@Anne O'Nymous every palaeontologist are coming after you

[@Mario-mw7nb]

Chickens, along with all birds are dinosaurs. I'd say 99.99% of dinosaurs went extinct.

[@jamesdunn9714]

The "giant" chickens disappeared, such as the T-Rex.

[@Sea_Leech]

@@jamesdunn9714 and also trex was barely related to chickens, their only way they are related is that they are both theropod dinosaurs, thats it.

[@davidpavel5017]

Hank:"... and of course, 100% of the dinosaurs." Avian dinosaurs: Am i a joke to you?

[@tarnahenderson2136]

For real 😭🤣🤣

[@christianvachon2235]

Exactly! Even the domestic chicken has been identified as a descendent of the T.Rex apparently...

[@davidpavel5017]

@@christianvachon2235 its not a descendant of the T. Rex but it is related to the T. Rex

[@christianvachon2235]

@@davidpavel5017 Thanks for the correction! I didn't remember the exact connection, only that there was one.

[@GodofWar5371]

@@davidpavel5017 then why are the chickens still alive?

[@MegaPerson2011]

Plot twist: the dinosaurs didn't die, they invented time travel and traveled to the future. They're waiting for us.

[@sampercival9617]

MegaPerson2011 ‘Hey can I copy your homework?’ ‘Yeah sure just change it a bit’

[@bgdhfytgy135]

@@sampercival9617 what?

[@iliketurtles5180]

Lol you just copied the #1 comment

[@jessewru6425]

I would say he improved it, just my opinion.

[@iliketurtles5180]

Still pretty unoriginal though

[@brucelee3298]

"Capable of killing 50% of all living creatures" it was thanos, obviously

[@soniak6836]

Most likely not...

[@lilylyons8885]

r/whoosh

[@dominicnyamache338]

If it was slightly bigger

[@Ace-rp7vr]

Perfectly balanced as things should be

[@cthulhu4411]

He said, "suck my purple nuts dino"

[@bsinger182]

This was just about the most intense episode of SciShow that I've ever seen. Great work. Hank really delivered an amazing script.

[@chrishei3111]

2022 now, this is just like his new ones today, I saw a 2012 one yesterday that made Hank seem like a ZOMBIE! he was so grey and seemed new to reading on camera! This is the start of the golden era of SciShow

[@GladDestronger]

So, in some ways the asteroid was the straw that finally broke the T-rex's back.

[@marcustulliuscicero5443]

It might be worth mentioning that the K-PG extinction also wiped the majority of mammalians from the map. The few lineages that survived radiated into different niches in the following aeons and became all the mammals we know today, from the largest whale to the smallest mouse.

[@jaimebergner]

I feed some crows in my garden - so I see little dinosaurs daily.

[@five7phew550]

I have a chicken outside lol

[@MaryAnnNytowl]

@@five7phew550 a _single_ chicken?? Those shouldn't exist. They are flock animals, and need company. #FactsMatter

[@NodDisciple1]

That's easy-THE ICE AGE! *Fires freeze beam.*

[@MartyAllocco]

"an asteroid the size of manhattan" shows a picture of an asteroid the size of the moon

[@rocketraccoon8560]

It's just a stockphoto he wasn't saying it was a picture of what he was talking about nor did he imply so.

[@NarmiPerfect]

iForkSpoons sub I love dinos

[@urmorph]

Proof, if proof were needed, that artists are not necessarily scientists. The same is true for musicians. Caveat emptor.

[@riseevil7131]

I did a comparison and their illustration's size is barely half of the Moon. Even though their commet should have been shorter than the highest cloud's altitude though. That's only if they were going with realistic size estimate.

[@user-dh3is]

iForkSpoons maybe Manhattan is the size of the moon? I don't know

[@Danmandingo]

*Everyone knows dinosaurs never existed...* *The bible never mentions them @________________@*

[@deancuban894]

......

[@alleczuthe1st180]

Guy, even I am Christian and I know dinosaurs have existed before, that is because although the Bible doesn't directly mention them, it says at the beginning God created all kinds of animals. That could well mean that dinosaurs existed. Plus, look at all the evidence around you. Wait a minute... is this a troll?

[@IAMLH]

Nick Grosso kirby... kirby!......KIRBY NO- *bang* x.x

[@deancuban894]

IAMLH :(

[@Benamon9]

Because that book is only like... 3000 years old? Way after the dinosaur's extinction.

[@Prettyordying]

This guy works more than I will in my entire life

[@zako8424]

4 years later we Finally know the Answer. *T H A N O S*

[@monsoon_magic2874]

One single abelisaur killed all the other dinosaurs? Whoa!

[@sack1036]

Nice

[@babyxenomorphPA1R3]

5 years later u mean

[@SERPENTHASHIRADEMONSLAYER]

It's 5 hi 5

[@criticalgaming5835]

Lmao

[@connerfuchs275]

*dinosaurs get beat to death by natural causes but are still standing* Earth: Finish him!!! *astroid brings on hardcore face as he pulls a k.o. on the dinosaurs*

[@myegosdeath]

Rko out of nowhere!

[@TheDarThaum]

Earth: "FINISH THEM!" Asteroid: "KAME-HAME-HAAAAAAAAA!!!" *boom*

[@voltair6013]

Anti dinosaurs win

[@wailingmeese5865]

SUDDENLY, BIRDS ( OLD DINOSAURS ) TAKE OVER THE EARTH

[@theincarnationofboredom207]

*tiny little feathery creature survives*

[@MrCmon113]

100% of the dinosaurs, hm? Then who sings in my garden?

[@josefk1491]

+Taxtro birdosaurs

[@cornkopp2985]

I do, every morning

[@kaixin8824]

It's just your imagination.

[@ashlynlongley3083]

+Tyam BlackWolf How are birds dinosaurs??? Did they somehow magically evolve from them?

[@MrCmon113]

Ashlyn Longley The only reason you think you can distinguish birds from dinosaurs, is because the closest relatives and ancestors of the birds we see today are dead. Indeed that is the only reason we can draw lines between any kinds of animals. There is no point at which you can say that an animal is no longer a dinosaur, but suddenly a bird. It will always stay a dinosaur - any other distinctions are retrospective and only apply to a snapshot of the world.

[@susanrobinson910]

I am watching this video in 2019...I have been binge watching SciShow vids off and on for a while. Love the information provided in this! I was unaware of some of these things.

[@serenemountain6769]

so you are aware that humans killed most of the dinosaurs ... kzbin.info/www/bejne/rKbMg3ehnJyXfMU for fame and glory ... and they were called dragons or great serpents... and other strange names. the term dinosaur is very recent it was only coined in 1880...

[@MaryAnnNytowl]

@@serenemountain6769 nonsense. There is _zero_ evidence for such absurd claims. And yes, the word was coined in the 1800s, because that's when paleontology really first started. That doesn't mean anything to do with any young earth nonsense, nor does it mean dinosaurs (other than avian ones) survived long enough to even see proto-humans, much less homo sapiens. 🙄

[@MaryAnnNytowl]

Susan, just be aware that he misspoke, and there is one clade of dinosaurs that still exist, the avian dinosaurs that we call birds. Oh, and that the weirdo with the other comment here is full of male bovine feces. 😄

[@susanrobinson910]

Mary Ann Bittle 👍😉

[@sasquatch_texas]

correction: 100% of the non-avian dinosaurs.

[@Anita_Dick]

Ikr who would expect this channel to make that mistake

[@milesarcher8502]

SORTA! Todays crocodillians are little-changed, other than in size, from their pre-asteroid progenitors!!

[@omfgstrid]

Rick Blain yeah but crocodilians aren’t dinosaurs, nor were they then

[@milesarcher8502]

@@omfgstrid But they ARE little changed from that era....and super cool!!!

[@LaLa-jv9pu]

@@omfgstrid they are in the same family tree!

[@zrksyd]

Not all of them died. We just call the remaining ones birds.

[@bobtheflyingdonkey]

ostriches are damn scary

[@melzymoomin888]

bobtheflyingdonkey they have biiiiig eyeballs.

[@MrJoostlaan]

The remaining ones evolved next to the dinosaurs and were separeted from the dinosaurs before they went extinct.

[@YamiZee]

birds are NOT dinosaurs. They branched off from them, but they are not them.

[@zrksyd]

But they evolved from those who survived.

[@ghostlourde2700]

100% of dinosaurs. 100% of dinosaurs, he says. I'm a scientist, he says. If I face palmed any harder I'd suffer a concussion.

[@TRCPDjjj344]

I was gonna throw a Sledgehammer but then I wouldn't be able to watch anymore KZbin!

[@ghostlourde2700]

***** Of course he meant non-avian dinosaurs. The reason I'm peeved is that he's supposedly knowledgeable upon the subject, hence his pontificating, so he should therefore know better.

[@ErgoCogita]

***** Why all the attitude and name calling? How about this: 100% of non-avian dinosaurs are dead as fuck. Care to argue this?

[@ghostlourde2700]

ErgoCogita It should be stone-dead fucking obvious that that's exactly what I'm arguing should have been said. Likewise, it should also be obvious that I really don't give the tiniest imaginable fuck about your opinions upon my attitude.

[@badantiherochato]

***** Salty

[@Depthcharger44]

"THE ICE AGE!"

[@Taurgar]

pity the fool that don't get this reference, well done

[@tokresaliali3805]

Thanks to Joel Schumacher

[@serenemountain6769]

humans.

[@06ridyn]

Imagine that rock altered our spin,speed and our position in space. To allow the perfect atmosphere for us millions of years later.

[@elijahcraig3477]

Well, not perfect... and its more of a case of life adapting to what it was given. In this case, the atmosphere. As the atmosphere changed, life was strained and those that could survive then lived long enough to breed. We didnt arrive here and found a perfect atmosphere, life evolved to make the best of the current situation.

[@StrideX21]

@@elijahcraig3477 nah bro you're black

[@beastcrozby4384]

@@StrideX21 bro what?

[@Unique_Monk]

Yes, amazing - but that’s the lies evolutionists tell us & they have nothing to back up their miraculous claims

[@paulj6662]

The temperature of their eggs affects the sex of some reptiles, if the average changed by a few degrees, one way or the other, this would cause a single sex population, and thus extinction; which is one of those neat "unseen consequences" ideas that could be right.

[@lakshyamongia3270]

Feminists take note of that.

[@madmachanicest9955]

Wow that real could have been a factor. Intorseting

[@trvth1s]

dinosaurs were warm blooded, and like all archosaurs could incubate the eggs to control temperature. Your suggestion also does not explain why other lizards including crocodiles and birds survived [they too have eggs]. Truth is the extinction was likely far more horrifying then most could imagine. Most bird clades went extinct, only 1 clade survived, likely from a small species which foraged and ate anything it could. Most mammal clades went extinct, only rat-like mammals survived, they too are small and forage, eating anything. Those were the only warm blooded animals to survive. More cold blooded reptilia and amphibian survived thanks to their low metabolism low caloric intake lifestyle. Crocodiles too have low caloric intake lifestyle and tend to be the biggest strongest carnivores in continents to survive extinctions, this is why they always seem to take over terrestrial superpredator niche after extinctions. The last extinction event was no exception. The last extinction event was at a faster passe then most others [though not as extreme]. Meteorite strike, volcano and toxic gasses killed many animals, but the real killer was the clouded sky caused by the meteorite, which killed vegetation first, global forests turned brown and began to decay, then herbivores began to starve, large once mighty animals all began starving, becoming aggressive, then carnivores began starving, a mass starvation, decay in mass, disease, etc until the meek inherited the world. This documentary gives you a good glimpse in a microcosm; kzbin.info/www/bejne/oHzYeXSeocRlpsU

[@billybiker5712]

Paul J thats actually a great theory also I'd say it's all of these elements combined except volcanoes I'm sure there was volcanoes then but i don't believe it was much diffrent than it is now

[@billybiker5712]

@@trvth1s was you there?? Nobody was and everything that's throwed out there is simply a theory based on mediocre evidence gathered here and there by a million different people claiming a million diffrent thing's and this event happened once it will definitely happen again probably not in my lifetime but hey you never know really after all life is just a theory!!!

[@Okamoto691]

I personally believe that both the asteroid and volcanic theories happened at the same time. These were the two main theories I learned in my Anthropology course since the extinction of dinosaurs is a highly important event for the evolution of the earliest primates.

[@cushla_de_arteest]

i agree with you, i think that both of these events helped lead to the extinction of the dinosaures

[@ThePunikaTV]

So basically ~66 million years ago someone got tired playing his "Sim City" game and chose to throw all kinds of natural disasters towards earth. Kinda sounds like something I would do. Nice.

[@booradley8232]

ThePunikaTV back then auto save was only on the Civ game

[@aboybaker123]

4:07 The K-PG asteroid impact had the force of 180,000,000 megatons of TNT. By comparison, the most powerful man-made weapon, the Tsar Bomba had a blast yield of 50 megatons of TNT. Humans are nothing compared to the forces of nature.

[@israfel070]

Love this video!!! As someone who was raised in a private religious school and received a poor science education, I'd really love to see more of how commonly-accepted theories were pieced together with the evidence.

[@gabrielcielolara7571]

Same experience but with alot more science but the religion outweighed the science and now I grew up a bit and started to use more science than 1 single book that could've been written by anyone and said "hey this is the story of god and other people related to him please believe me"

[@euantheyutyrannus]

I... Have no words.

[@chrisallen9509]

When science is taught properly, it is truly amazing and insightful and also makes one question about pursuing it as a real career. When it is taught poorly, it makes it unbearably hard and flat out stupid/uninteresting. Thank you for not being the 2nd one

[@Raccon_Detective.]

Agreed school needs to show these video .

[@michaelmcchesney6645]

I didn't realize that the asteroid impact theory for the extinction of non-avian dinosaurs was so recent. I thought that had been the explanation even when I was a kid, but I was 12 in 1980. You can learn something new every day.

[@darrellcole6311]

This video is a yr or two old. now there is the Greenland meteor to include in an extension event. Have been watching SciShow for a few yrs and enjoyed every episode. i think that the Green brothers do a great job in bringing science to the masses.

[@theldraspneumonoultramicro405]

sometimes there is no single answer to our questions but rather a lot of coinciding ones.

[@lakshyamongia3270]

I have been trying to pronounce your name for last 2 years, but i wont give up.

[@decree4644]

Same

[@netabolt6546]

your name should be a new slamming brutal death metal band name. Pneumonoultramicroscopicscilcovolcanoconniosis.

[@spvillano]

@@netabolt6546 named for an extremely unpleasant way of dying from inhaling silicates from a volcano.

[@trinity1969]

I can say your name.

[@thedaver8]

Iridium? Must have had some Vault Hunters back in the day. ^_^

[@ThatSoddingGamer]

Well, it's spelled Eridium in BL2, but it's a homonym and you just switch one vowel for another. No doubt Gearbox got the name from the real element.

[@thedaver8]

That Sodding Gamer I know, dude. It was a joke.

[@Cythil]

There is also the old game Uridium ;)

[@wntsumcandy]

Why do you think its so rare?! Its all in the vault! DUH!

[@ThatSoddingGamer]

Dake Townsend I know, but it was entirely possible you didn't know how it was spelled in the BL2 game.

[@WTH1812]

The missed connection between the asteroid impact and the Deccan Traps is the position and timing relative to each other at their antipodes. The Deccan lava flows began about "66,000,000" years ago, maybe 65,000,000, or around the time a massive hammer struck Earth on the opposite side creating shock waves in the crust that radiated out and met at a weak spot on the far side, fracturing the crust and unleashing copious lava flows.

[@suvangoda7773]

The 1K dislikes are from dinosaurs. Because there's still roaming the Earth, and they're annoyed because we think they're dead.

[@EpicB]

Fry: What really killed the dinosaurs? Giant brain: ME!

[@DoggyAjax]

Whatever

[@Julian-ib9jy]

Lol I get it

[@zelex1456]

Futurama!!!!! :D

[@Jalino123]

Could you do a video about the inland sea in the middle of America? I've never heard of it and I'd really like to know how that went from being below sea level to being the Rocky Mountains. That is kind of unbelievable.

[@thenorthshow3655]

It wasn't the rocky mountains but the great plains to the east of the rockies

[@mervviscious]

strangely enough, that was the same reaction that happened every time my ex (dead) mother-in-law came over...mi;;ions were killed, entire species wiped out... the sun would dim... huge tsunamis and happiness was sucked away into a dark pit of dispair...lemmings would die by the millions...

[@Sammiomg]

Thank u for all your information!! It help alot for my science fair project!! I'm sure my teacher would look this!!!

[@SilentCheechGaming1991]

THE ICE AGE!...hopefully someone gets the reference.

[@DoggyAjax]

I don't get it

[@TheVideoGameNut]

Doggy Ajax Mr Freeze

[@Julian-ib9jy]

Lol

[@maximjager7953]

I was watching this video than I saw your post. Saw your pic. SAW!! The Venus trap classic :P

[@kalmont84]

Silent Cheech Let's kick some ice!

[@H4WK6969]

Noah killed the dinosaurs because he didnt make the door on the ark big enough for them.

[@mistbakuga]

lol

[@1510vick]

Nah, he did but the little dinosaur arms couldn't reach the door handle

[@PlaidHiker]

No, the dinosaurs slept in on the flood day and missed the ark

[@JellyButter123]

What the fuck is wrong with you?

[@charliekerman8951]

Kirrim Kerman Oh hi Kirrim!

[@terryskocher1349]

It was the Mesozoic era and the Cretaceous period. 98% of all species that have ever lived are now extinct. I tutor on line everyday and use your videos all the time. All of you do a great job. thank you

[@brianchify]

Great job! Love you guys!

[@Kazyu]

What really killed the dinosaurs you ask? the answer is "arnold schwarzenegger"

[@yousefbeloushy1410]

😂😂😂😂

[@atmosphererobin3103]

+Nicholas Masci I got to tell you I'm a undertale fan too!

[@nabilahmed2799]

LETS KICK SOME ICE!

[@savagedude4205]

Everyone chill.

[@atmosphererobin3103]

xXMemE_ Master69Xx heck no

[@BON3SMcCOY]

You know an episode of Scishow is going to be good when Hank or Michael start of by saying something is way more complicated than we thought.

[@sixstringblues06]

I just realized this is Hank that sang with Peter Hollen! So cool!

[@FluffyClaws446]

@6.30,why is the credit listed as hashtags for that photo??

[@TheDotdotdot0]

They're not dead. They're still alive in our Hearts.

[@michaelfutch2598]

And nightmares

[@1ns939]

Dinasours we're kidnapped by aliens and are now in space farming all the crops in spaceville

[@athanassiospagalis913]

exactly

[@locngoduy1571]

NatureFurever dude, the observable universe is 92 billion light years in diameter (and that's just the observable part only) and you're saying that there are no extra-terestrial life? We have no proof but we know they exist, we just didn't found them yet (google Fermi paradox for info). Also, NASA can not be so sure that there's no alien life, since they're not the one who created the universe.

[@ranjithreddy4523]

Aditya B

[@user-jg5lq4wk8l]

NatureFurever calm the calamities that are your mammaries

[@messiah2203]

Lucid Abyss there is actually a book where this sorta happens.

[@christianvachon2235]

How about volcanic eruptions followed by a pole shift and crustal displacement. That would explain far more the temperature shift.

[@albertsammut433]

Whatever was the cause of the drop in global temperature around 65 million years ago and the coming of the Great Ice Age..this was the main reason why plant and animal life at that time frame so accustomed to warm and stable higher temperatures met their demise..they had no way of adapting to such cold changes rapidly to survive.

[@puddleglummarshwiggle4236]

Noah's flood!

[@MaryAnnNytowl]

@@puddleglummarshwiggle4236 no. Kindly wander over to Hovind's channel. This is a science channel, and bible studies do not qualify as science.

[@puddleglummarshwiggle4236]

@@MaryAnnNytowl you don't make sense...I'd suggest seeking the truth and not self soothing deception...

[@Scorch428]

The dinosaurs all left Earth to go colonize Mars. Everyone knows that.

[@cuteanimal4957]

No

[@raid9913]

@@cuteanimal4957 it's a joke...

[@ilylarina]

Pfft! How will they travel to mars? ●_●

[@ManicCow]

@@ilylarina Shhhh

[@andyhaochizhang]

@@ilylarina they got yeeted to Mars when the asteroid hit the edge of our flat earth ofc! That’s why only avian dinosaurs remained because they were not touching the ground!

[@Geefchips]

curiosity killed the dinosaurs

[@julioarriola7]

Smiterbiter LOL

[@animallover9378]

What an old joke ..a prehistoric one

[@milesarcher8502]

Actually they smoked and drank alot!!

[@marychristie4815]

But satisfaction brought them back- *o h s h i t*

[@ashtonbrown4318]

No kermit did

[@amandaleblanc5904]

Hold up... Just a thought, but convection in the earth's mantle both moves the tectonic plates and creates the earth's magnetic field which helps deflect solar winds. So, during a period in which that convection has slowed down enough to cause severe marine regression, wouldn't the earth's magnetic field have been significantly weaker? Might that have contributed to the extinction as well? Also, I know our magnetic field doesn't deflect large objects, but is there any research suggesting that it could influence the trajectory of large, metallic meteors?

[@MerkhVision]

That’s a really good question! I don’t know about the meteor part, but I’m sure a weakened magnetosphere allowing a lot more solar radiation into the Earth could easily be another important factor that contributed to the extinction events at that time.

[@Salt_Master_Queue]

Dang, coming to this video after all this years, Hank has really grown up

[@Lexcepcion]

Hearing the names of the dinosaurs and reptiles and knowing exactly which organism he's talking about without even seeing the pictures is so neat. Thanks geology 2.

[@Ghost-Rider667]

100% of the dinosaurs?...but Wait aren't birds Dinosaurs...

[@MsBeronica]

no, they are their ancestors lol some dinasours just evolved to adapt to their new habitat so thats why theyve changed so much

[@jhoudytuwo6201]

+Smurfette98 Komodo?

[@ZenoZaneZedd]

Read the annotations

[@slimeturtlevsgaming8230]

Josue DeAmerica wait what

[@paul.d4990]

Cheyenne Barnett some Dino have feather though

[@samy6833]

6:27 Its commonly called the 'Deccan Plateau'

[@bluetextbooks]

100% of the dinosaurs? I guess, we aren't including the raptor's descendants, i.e. birds

[@StrangeAether]

They branched off way before the extinction event took place. By then, you'd have to be splitting hairs to call them actual dinosaurs.

[@bluetextbooks]

TheChecklo Using proper terminology, birds are avian dinosaurs; other dinosaurs are non-avian dinosaurs, and (strange as it may sound) birds are technically considered reptiles. Overly technical? Just semantics? Perhaps, but still good science.

[@vaguevocalist17]

TheChecklo It's not splitting hairs to call them dinosaurs. Groups of animals are not classified by the "era" they live in, their life-style, or their connotative meanings. They are classified by their evolutionary path and skeletal structure. I don't think it's a simple matter of semantics to CALL them dinosaurs. They ARE dinosaurs because they have the skeletal structure of dinosaurs, descended from theropods (dinosaurs), and are, by definition, dinosaurs.

[@bluetextbooks]

vaguevocalist17 thank you, my good man, thank you.

[@Dinoman9877]

bluetextbooks A bird is a bird. A dinosaur is a reptile. Birds were around just before the cretaceous began. By the time the meteor came around there was hardly any resemblance to the remaining dinosaurs. The ancestors of the birds were almost completely dead. (Microraptors and species like that.) Tyrannosaurs and ceratopsians tended to be the most common, hadrosaurs were actually becoming less common, and dromaeosaurs, such as velociraptor, were quickly disappearing. Troodon has been proposed to be one of the last raptors, as well as one of the last species of dinosaur to go extinct. If birds were able to be considered similar to dinosaurs during that time...We shouldn't have chickens today. Or we should have microraptors gliding from tree to tree. The differences are enough that they cannot be considered dinosaurs. The true dinosaurs went extinct. They're just the descendants of a species that had traits no other dinosaurs had.

[@EthanBalkfield]

wow... those poor dinosaurs just didn't stand a chance, did they? they're like the ultimate bad luck brian :/

[@jack_freemen9673]

Thank you for a knowledge

[@samuelerickson8155]

Also The Siberian Traps eruptions were the Worst Period of Volcanic Eruptions happened During the End Permian Mass Extinction. the Deccan Traps were tiny in comparison. and were not as nearly much as a factor in the Mass Extinction at the end of the Mesozic era, but it did play a role.

[@a_rice_bowl3663]

So basically the asteroid was like using the finisher after you've won a match in Mortal Kombat.

[@Maxtez]

Wait, aren't birds descendants of dinosaurs?

[@dinoboyoutuification]

tomtomed1 Yep, wrong.

[@vaguevocalist17]

Birds ARE dinosaurs. They are dinosaurs in that they are descendants of them and still have the skeletal structure which defines dinosaurs to be dinosaurs. It's simply not true to say that 100% of dinosaurs died, as it is widely accepted that they (birds) are the only live members of the clad of dinosuaria. They came from the theropods, I believe in the jurassic period.

[@TheHumbleBeez]

Yes they are, and as such they are themselves considered dinosaurs. The "fact" stated in this video that 100% of dinosaurs were killed during the extinction is false.

[@Maxtez]

TheHumbleBeez That is what I was thinking! "Based on fossil and biological evidence, most scientists accept that birds are a specialized subgroup of theropod dinosaurs. More specifically, they are members of Maniraptora, a group of theropods which includes dromaeosaurs and oviraptorids, among others. As scientists have discovered more nonavian theropods closely related to birds, the previously clear distinction between nonbirds and birds has become blurred. Recent discoveries in the Liaoning Province of northeast China, which demonstrate many small theropod dinosaurs had feathers, contribute to this ambiguity. Nonetheless, on 31 July 2014, scientists reported details of the evolution of birds from theropod dinosaurs"

[@InorganicVegan]

Marine or airborne lifeforms cannot be dinosaurs. That's one of the first criteria. -_-

[@crazycatlady39]

"We still don't have one single answer..." Why do people think we always need one answer? Why is it so impossible that it was simply one thing too many?

[@pauldavies8638]

Asteroid plus ice age plus pangea breaking up

[@MerkhVision]

Hank at 0:03 is doing the Palpatine “Unlimited Powah!” pose and motions hahaha

[@KunoichiN3rd]

As a literature student, I've studied several cultural versions of the Great Flood story and have always kinda thought that that was somehow connected to the K-Pg and extinction of the dinosaurs. Could it have been possible that the asteroid impact and/or volcano eruption could have caused the tilt of our planet's axis, contributing to the atmospheric changes, floods, etc.? I'm curious to know your thoughts. I've always thought the Great Flood had to have done SOMETHING monumental in our Earth's environmental history, since so many cultures around the world paint this very detailed and catastrophic doomsday story.

[@HerrLBrodersen]

If you look for real life great floods, you are a bit off with the time frame. The break at the Dardanelles, that flooded the Black Sea or one of the several opening and closings of the Baltic Sea a better candidates.

[@arachnophilia427]

no, it could not have been possible. there are no humans found anywhere even close to the K-Pg boundary. it is not an event that occurred within human history or pre-historical memory. you get flood myths in a wide variety of cultures because a wide variety of cultures grew up around established water sources such as rivers, that sometimes flood. some general similarities are necessary for the sake of having a story (ie: a survivor) and they mostly exist in religious contexts. but the only ones that are really close to identical are the various descendants of the akkadian myth: gilgamesh, and the bible.

[@WoWplayer527]

Look at when the dinosaurs went extinct 65ish million years ago. Look at when modern humans came into being, 300,000 years ago. Do you think humans could even think that there were other things to walk the earth before them for 95% of that time?

[@diceman199]

There have been many real huge floods in many parts of the world which is why most cultures have a flood story. Look into the black sea for one. Glacial lake collapses are another cause of huge floods. England used to be connected to mainland europe and that area was populated....it's now underwater. en.wikipedia.org/wiki/Doggerland These things though were from between 6 to 10 thousand years ago so basically yesterday when compared to the K-Pg event

[@arachnophilia427]

i think you're looking at multiple origins for the mythology, not a shared origin.

[@animeacademy852]

We all know that Beerus from Dragon ball super killed all the dinosaurs!!! 😂😃😉

[@blackgoku3598]

lol true

[@animeacademy852]

+saiyan gamer 😂😉

[@Jaricko]

Not all of them. There are still a ton of them in Dragon Ball and Dragon Ball Z... so that line in super was actually rather weird.

[@mobilegamer4882]

Oh yeah 😂😂😂😂

[@colbyv9682]

Hmm everybody's forgetting one Dino who lives in our world allegators and birds are still hear!!!!!

[@rolonnemarieross7243]

Thank-you for that. Really interesting. Regards R.M.Ross

[@shenghan9385]

Darling, what's for dinner tonight? We are having roasted dinosaurs. 😢.

[@MrAppleSalad]

"what killed the dinosaurs? THE ICE AGE"

[@sucktitles]

Nevah leave tha cave withouddit

[@wildatheartforever5358]

MrAppleSalad no

[@TheVideoGameNut]

Wild at heart Forever Looks like somebody didn't get the reference.

[@Julian-ib9jy]

I get it

[@pootersmasher4875]

"Chill"

[@MicroBlogganism]

"100% of the dinosaurs" Apparently birds aren't real..

[@bergonius]

Birds are not dinosaurs. Sort out your sources.

[@MicroBlogganism]

bergonius As of current Aves is classified as belonging to the clade Dinosauria, making them dinosaurs.

[@MaryAnnNytowl]

@@bergonius yes, they are. They are listed as avian dinosaurs. Just because you don't like it doesn't mean it isn't true.

[@oiuy_Gacha]

I think that tamu massif erupted since well it was formed during the jurassic period and it is like 300 miles big It just found a way underwater. my friend thinks a big rock was blocking it and when tamu erupted the rock went flying and hit some part of the earth

[@dimetrodon2250]

Extreme volcanic activity and ocean regression is slowly killing everything off. One T-rex says to another "at least things can't get any worse, right?" Then the meteorite crashes, immediately vaporizing his face off.

[@bobbyb9258]

"The Ice Age" see Batman & Robin

[@wesley_james_strength]

+Paul Allen lolololol

[@WDShorty]

I'm confused as to why other land animals never grew that big after the Dinosaurs :o

[@kiitttenzuzu7600]

The amount of oxygen in the air was severely diminished because of the extinction of many plants that produced oxygen.

[@TWENTYFO5]

There was a greater abundance of oxygen which allowed the creatures of that era to generally be much larger

[@WDShorty]

Thanks guys! Gotta love this community :)

[@TheDrawdex]

Tha Halcyon X ._. I hope you understand that you got lucky the civilized bunch found you first. XD

[@WDShorty]

Draw dex Right?!

[@billbutler2452]

I'm 67. I read, as a teenage, the crater in the Gulf of Mexico was found by geology research teams doing a survey of the Gulf, (the premise was searching for oil fields) taking core samples, bringing the samples back and analyzing the materials, marking the findings on a map of the gulf. This showed unusual iridium readings and the variations showed concentric rings, leading to the Asteroid crater theory, which plugged in well with the rest of science discoveries at the time. So I guess it was a different, but somewhat correct, 'Old Wives tale" of how the theory came about.

[@RichardRenes]

I think the arrival of flowering and fruit bearing plants may also have had a part in this. They replaced the coniferous trees, that much of the herbivore dinosaurs relied upon, around the equator. Worse yet: dedicious trees are seasonal, which means that for a good part of they year, they would not have anything edible for herbivores dinos. Mammals were quicker to adapt to this. By the K-PG extinction event, you already had rodents and primatomorphs

[@haileennevsmom09]

so complex

[@jaysun9138]

This might be a dumb question but, I can't wrap my head around it. Why are there no photographs of the Chicxulub crater?

[@tobymcgarry25]

It's been buried by layers of rock, and half of it is under water, so it wouldn't be a very good picture 😃

[@jaysun9138]

tobymcgarry25 Thanks :) sorry my brain is scattered right now 😐

[@pizzasauras9274]

The crater is called the Gulf of Mexico

[@pizzasauras9274]

Or at least a chunk of it

[@alangebhardt8286]

What about the dinosaurs that evolved into birds? Wouldn't the amount of dinosaurs that got wiped out need to be less than 100%?

[@monkeyneil578]

yes but birds even though they did evolve from small theropods they are officially not consider dinosaur. Its like calling mammals reptiles, we evolve from them but no longer are.

[@Ghettofinger]

They evolved, their ancestors died. At one point, the dinosaur and the bird that evolved from it were alive at the same time, the dinosaur went extinct, the bird didn't, hence 100% of the dinosaurs went extinct.

[@Ghettofinger]

***** Dinosurs are like amphibians and synapsids, they are transitional creatures. They are bird like reptiles, just how amphibians are fish like reptiles, and synapsids are mammal like reptiles.

[@EliosMoonElios]

Dogs are not wolfs anymore. · If wolfs get extinct then 100% of wolfs get extinct, dogs don't count as wolfs.

[@chiar0scur0]

EliosMoonElios Canis Lupus is still Canis Lupus

[@billc.4584]

You forgot to mention Robert Bakker's theory that the contemporary continental configuration permitted previously isolated species to interact increasing the chance of introducing pathogens for which one group, or the other, had no immunity tolerance for.

[@marvinmartin4692]

Especially when the Dino fossils fissile out long before the KT boundary!

[@lukewunderli4191]

Scishow: and 100% of the Dinosaurs Birds: Are we a joke to you?

[@liam_iam]

No, I killed the dinosaurs.

[@liam_iam]

Get your facts straight dude. Don't you remember?

[@liam_iam]

***** really :l

[@sth128]

NO I AM SPARTACUS!

[@noname8791]

You are all wrong Chuck Norris killed them

[@sth128]

chris song No you fool, Chuck Norris does not kill. If Chuck Norris wanted you gone, he would wipe you from existence altogether and not leave behind fossils. When Chuck Norris got upset with God, he punched God from existence and we call that today the Big Bang. Nothing came before except Chuck Norris.

[@spudato961]

100% of dinosaurs? Damn, I didn't know birds were dead

[@toalutoriangaming]

Spudato birds are a government conspiracy.

[@austin5335]

And alligators

[@michaelfutch2598]

They're dead to me.

[@xflora-chanx]

Chicken and Loch ness Plesiosaurus too lol

[@illaneecorona]

For the remedial ppl.. smaller animals & ancestors of current ones today actually survived. So spare us the bird sarcasm. Lol.

[@totaltruthtoddshaw7054]

My only question how long extinction took? All in a day,week,month,year? Or was it multi?

[@suyogyashrestha3059]

A question if the earth's tectonic plates stop and the marine life is so affected that many of the species start to disappear we know that we will be able to save some of them in aquariums and all in a well-maintained population, but what about those who rely on plankton and other microscopic foods sources like whales. Can we save them and how?

[@tiiiimmmmmm]

"What killed the dinosaurs? The ICE AGE!!"

[@808thampire]

If the dinosaurs had never died out, would they have eventually evolved into intelligent humanoid beings? In other words, would we be reptilian people?

[@WoWplayer527]

No you wouldnt be a reptilian creature. Humans never would have existed and mammals would likely just be rat like creatures living in caves like they did before the dinosaurs went extinct.

[@wjun0131]

Human intelligence was formed out of necessity. For Dinosaurs, when you have huge claws, jaws and gigantic muscles you don't need higher intelligence to gather food. So no Dinos would've stayed dumb.

[@cooljayhu]

Ibliss Haven't you see Super Mario Bros.?

[@Lun4812]

crocodiles and sharks didn't; and those creatures have been here since the days of the dinosaurs

[@latenighter1965]

Luna a species of them are still here, but not the same species or genetic background. Just as we have monkeys here and us, the sharks that are here could be of the same type of species but not the same species themselves, so those earlier ones could have evolved like humans into something else, if given a chance.

[@SamanthDarling]

When I was a kid I thought nobody knew how the dinosaurs were wiped out. You can imagine my reaction when I was told that it was more than likely an asteroid.

[@zedantXiang]

lol

[@johnlibonati7807]

My father and another soldier watched a living mosasaur swim around in a slow moving river in Vietnam in 1969 for a couple hours. He used to draw it at holiday parties for the kids and describe what it looked like as he told the story. I sent the drawing to the Academy of Natural Sciences in Philadelphia, USA in the mid 1990s. The head of the dept of paleontology actually called me and said my dad saw a living dinosaur, a mosasaur. He said it wasn’t the only report and there were sightings in SE Asia and Australia.

[@meganofsherwood3665]

Okay, that's really cool

[@FriendlyLlama]

First to watch the video. Not to get raped by a bear,a snake, a Shrek, or to go extinct, or to get "Julius Caesared".

[@speedydog45]

things first I'm the realest

[@Fatmanstrangler]

***** Wat

[@MetalRuless]

First to go extinct.

[@wntsumcandy]

...To get castrated by a wooden spoon

[@jakesimmons5849]

.... To get raped by shrek!

[@merveilmeok2416]

“What REALLY happened to dinosaurs?” I could answer that question in a jiffy if you take away the word “Really”.

[@billylucius7288]

the answer is 42 - Douglas Adams

[@OldMtnGeezer]

Your rapid-fire, spliced-together-with-no-natural-pause-between-sentences delivery is downright exhausting. Give me Sir David Attenborough any day.

[@dkenmiller9829]

I am frustrated and annoyed when "Manhatten" is used as a metric. I have never been anywhere near that place and I have no knowledge of its size. Please use standard units that we all can relate to.

[@janrudzki5651]

Sorry Hank, but you`re wrong. It was the Reapers whipping out the super advanced space faring dinosaurs, so that we could evolve. The Iridium is from all the spaceship wrecks while the climate change was a super weapon released to get rid of the rest of dino resistance. And so the cycle continues.

[@michaeljones1560]

It took a minute to read that

[@peloteroification]

Lies, I have a raptor at home.

[@theaidenvids]

Stupid

[@theaidenvids]

Lokiou

[@clarifyvr9524]

Joseph Stalin lie

[@Julian-ib9jy]

Lol

[@pokemonfans6745]

Joseph Stalin I think that you have Miscrits- zaptor

[@latrodectusmactans7592]

“In the middle of the most severe volcanic activity the Earth has ever seen” Not even close. Even the infamous Siberian Traps aren’t comparable to stuff like the Hadeon’s lava fields.

[@nitzan3782]

I don't think the earth's formation counts. But yes, the Siberian traps are worse. The Great Dying didn't happen in a vacuum.

[@retard_activated]

We need an updated version of this vid with the recently discovered dino leg. 💖

[@neozasshi]

It was Lord Beerus.

[@jamesdillon4748]

lol

[@alexanderlaureano6174]

Checked your account and you watch game grumps and dbz! Ayy lmao

[@aonbrogan8266]

Except dinosaurs still exist in dbz.

[@jamesdillon4748]

true giran is a dinosaur on dragonball

[@Wulfnstein]

Neih, the dinosaurs probably knew about the impact going to happen and just left earth in their spaceships. they probably went to mars but boy were they disapointed when they landed there.

[@MAGAman-uy7wh]

When did the K-T boundary get "name changed" to the K-Pg boundary and WHY?

[@adamkahmann2937]

I haven't watched the video yet, but the first thing I thought of is Mr. Freeze saying, "The Ice Age!!!"

[@charlievm2597]

YEAH,why did an asteroid kill the dinosaurs?How come there are no asteroids now in days?

[@bravetoast7481]

Charlie Wainwright because jupitar gets in the way and absorbs while the asteroid that killed the dinosaurs is because they probably didnt have jupitar or something but yeah

[@Fuar11]

Charlie Wainwright because we got lucky and there are asteroids in our modern days

[@crypticeyes2157]

Staticmesh Wavelength not if the scientist find and shoot it before it hits

[@johnnybestjojo7789]

jupiter has existed longer than earth, on the day of the asteroid it just failed to gravitate the steroid away.

[@ocbee6175]

CharlieXW258 it is a rare event, and almost never happens