The Giant Dinosaur That Was Missing a Body

[@iksarguards]

•Lives many millions of years before ostriches •Gets named ostrich-mimic Harsh.

[@patrickmccurry1563]

Any smart animal gets called human-like despite us being one of the youngest species on Earth. It is often odd how we label things.

[@Mr_Rykes]

Roblox being being called a Minecraft clone even though it was released 3 years earlier:

[@technopoptart]

@@patrickmccurry1563 it's not about age it's about popularity. gotta play the game to get the name!

[@needfoolthings]

Yeah, the ostrich should be named Ornithomimomimus.

[@LadyhawksLairDotCom]

LOL!

[@diegojimeneztamame1646]

The poor guy was tired of being told "grow a spine" by his father, so one day he just freaking did. The rest is paleontology.

[@dylanandrews7798]

Diego Jiménez Tamame underrated comment

[@williamsapong81]

Or “the rest is prehistory”?

[@movedtocupowarriors4205]

William Sapong hAh No.

[@drhoneybadger]

Lmao

[@gregfam6250]

Comments like yours give me hope for KZbin.

[@krzysztofrolbiecki9459]

When I was 6, I read in Polish children's book about dinosaurs that Polish archeologists had found Deinocheirus's arms in Mongolia. At the time to me it was a great puzzle that wasn't likely to be solved. As years went by, I forgot about this, right until you posted this vid and it brought lil bit of childhood memories. Thank you Eons.

[@KRJayster]

Oh, wow, that must be an incredible feeling. Thank you for sharing, it made me smile.

[@carktheshark]

There’s a documentary on Curiosity Stream, called Amazing Dinosaur World. It shows this Dino and it has great cgi. I recommend!

[@陳嘉宇-y4q]

Same here :)

[@TheRunningLeopard]

Krzysztof Rolbiecki I remember reading a book about it when I was young as well, and it was fascinating to wonder what it could have looked like.

[@someguy3186]

I read about as a kid as well. It was thought then that they belonged to a gigantic carnivore. I used to imagine how big it must’ve been. The reality turned out to be quite different, haha.

[@GatoGato1985]

My father took part in those Mongolian expeditions with prof. Zofia Kielan-Jaworowska. I always love to hear his stories about them. He is still active in the field. Some specimens found on these expeditions are now in the Warsaw Evolution Museum.

[@command3rcodybrickfilms266]

Cap

[@sourlemon3337]

I really like how you show the scale of the fossils, it’s really helpful.

[@buttsagonton101]

@Flavius Stilicho interesting, yet terrifying....

[@YosiahW]

Inaccurate but nice. I learned that this lady is the last living giant.

[@Gray-Wolf]

It is

[@strokeguy4835]

Robert Pearce bone zone

[@sandeepsangeetha6762]

me to!!!!!!!!!!!!!!!

[@MultiCappie]

I saw the lecture from Phillip Currie in Edmonton where he broke the news of the solution to the mystery. I went in excited, but I came back out nearly in tears and angry at the fossil poachers. EDIT -- That's his photo at 5:10 and himself at 6:38 . He's basically the head of the team of un-named scientists the video keeps alluding to, who assembled the clues and revealed the finds. He's a scientist from the University of Alberta (which is in Edmonton, Canada.)

[@kinomora-gaming]

I know this probably almost never gets said, but I really appreciate how your editors never show a purely static image. You may show pictures taken of fossils, or an artists interpretation, but there's always some kind of motion or effect applied to the image and it's very nice.

[@dakotahenry7]

Literally the first image is static lmao

[@Gunandrunandgun]

@@dakotahenry7 It's not look at the background.

[@binoodle511]

@@dakotahenry7 the background is literally moving

[@Crusader1089]

I used to see those huge arms in the Natural History Museum in London all the time as a child, and I'd wonder at the great beast that originally owned them. I am so pleased to know this mystery has been solved, even if it isn't the super-mega-ultra-death t-rex my childish mind imagined.

[@sorrenblitz805]

Nope just a big ol duck.

[@cintronproductions9430]

Ah, I love Deinocheirus. It went from being the most mysterious dinosaur ever to one of the most well known. We now know every bizarre feature of its body (the tail-feather fan, the spoonbill, the hump) and its diet. Goes to show how one must never give up and that even the most baffling mysteries can be solved if you try hard enough, even if it takes years.

[@siyacer]

One can only wish it becomes famous like the T. Rex.

[@cintronproductions9430]

@@siyacer Well, it's not as famous to the general public as Tyrannosaurus, but it's still pretty famous among paleontologists and dinosaur fans.

[@batspidey7611]

Deinocheirus is one of my favorite dinosaurs just because of how strange and mysterious it is.

[@mael6513]

So a Therezinosaurus?

[@myramadd6651]

I like the Therizinosaurs. They're weird.

[@justsomekrakenwithinternet5965]

Imagine if Deinocheirus didnt have an actual body and was just a floating head

[@selenahatfield5645]

I thought the arms could make a neat ghost pokemon.

[@HappyBeezerStudios]

Just floating arms. They can wave and give high five.

[@shintsukimi8530]

Guys it's haunter

[@Victor-kt6qn]

:0

[@hankwilliams1192]

You're a carnivore walking around and then all of a sudden 2 giant arms start floating towards you

[@collinsmilgo8869]

When you look at its bones it looks like a demon dinosaur sent from hell, then when you see how it actually looks with all its flesh and fur you realise it just looks like a cute oversized bird lol

[@rizizum]

Anything can look like a demon if you look at the bones only

[@domination1985]

looks like it's from Sesame Street Fight Club Edition

[@aaronsmith5864]

You know that's almost certainly not what it looked like. I mean sure they are educated guess but there still just guessing.

[@solistus]

It's fascinating how popular depictions and scientific understandings of what dinosaurs looked and acted like have shifted over time. Back when we assumed they were all cold-blooded and similar to modern large reptiles, we thought of them as big, dumb, slow creatures. Then we realized they weren't all exotherms and that our assumptions about their metabolic rates and activity levels were misguided, and that Land Before Time-esque image of giant herbivores standing around like statues or slowly plodding along gave way to Jurassic Park's terrifying murder lizards, with those seemingly docile herbivores also being seen in a new light since they had to be able to either outrun or outfight those vicious apex predators. And with the revelation of proto-feathers / "dino fuzz" and an ever expanding knowledge of the rich biodiversity of mesozoic life, the range of popular perceptions about what a dinosaur can look and act like is also expanding, particularly to include more bird-like features and body plans. I wonder what our depictions of dinosaurs will look like in another 20 or 30 years.

[@ScionStorm1]

*Bird fur* ?

[@29jgirl92]

Scientists naming animals they've discovered- "imma roast this guy! In Latin"

[@davidhildebrandt7812]

*ancient greek

[@christinaioan5429]

@@davidhildebrandt7812 just Greek actually

[@anne-droid7739]

Some use their powers for good. In "Trilobite: Eyewitness to Evolution", Richard Fortey mentions naming a "particularly attractive trilobite" after his wife.

[@shemer00]

This is hilarious

[@sahrajevo]

Sounds like my teacher.

[@thespaceace8164]

I can't believe someone would vandalize a fossil just to get ahead. :/

[@CornerCaseStudio]

Hello there! I see you are new to humanity and the internet! I am a Nigerian prince - perhaps we can talk privately, as I have a very lucrative offer for you? ;)

[@thespaceace8164]

@@CornerCaseStudio Very European name for a Nigerian prince, don't you think? Anyways, that scam is old news and I'm not sure what you're even trying here

[@christofferpettersson]

@@thespaceace8164 He is just trying to point out that there are people on this planet who would do anything for personal gain. I also find it hard to believe but I have now more or less accepted it. Which sucks.

[@thespaceace8164]

@@christofferpettersson I was making a pun,. Also, that was a rude way to "point out" that there are bad people out there so I have the right to respond with snark.

[@Ilikeavocados123]

TheSpaceAce it was funny lol

[@brendangolledge8312]

The hump was bred there by ancient cave men so that they could attach a saddle and Fred Flintstone could ride it to work.

[@fredricktalbot1945]

I admit this was my first thought too. Totally the right spot for a saddle and it would of been a hell of a ride!

[@januaryparrish3150]

Omg yas XD

[@Prof.Megamind.thinks.about.it.]

Oorr... It had a survival-related purpose , such as fat-storage or weight-balance . Now considering that geese etc. , don't need arms to feed on vegetation , it stands to reason that they served a different purpose . The obvious one is for catching fish , with defending itself also being credible . Lastly , the pygostyle . This tail-feather support-structure would have given Deinocheirus' tail the appearance of a branch with a smattering of leaves upon it . Logically , Deino. was camouflaged in order to deceive fish , and attract them to it's shadow . It follows then that the dinosaur had rough-looking, dark-colored plumage . This to appear like a mostly-dead tree trunk . *To compare Deinocheirus to it's fully carnivorous counterpart Spinosaurus , read my post at : quora.com/The-Spinosaurus-has-been-downsized-and-is-now-only-3-tons-and-12-meters-long-Is-this-true/

[@albertchehade9916]

😁 😂 😃 😄 😅

[@gwen1488]

You must have taken a trip to the creation museum in Kentucky

[@FlyingFocs]

Ahh, Deinocheirus. I remember being a dino obsessed kid back in the day when all we had were these arms, and everyone thought it and Therizinosaurus were these huge, vicious predators. Let's all have a laugh.

[@raymondancog6741]

I remember those two mentioned in the book Dinosaurs: A Global View by Sylvia and Stephen Czerkas back in 1996. Yeah at the time only the arms were known and they were drawn side by side for comparison. Fast forward to 2020 and now we know so much more about that.

[@cyansloth1763]

I remembered them too! It's so awesome to see how things progress.

[@unexpected2475]

I still wouldn't want to fight one, herbivorous or not

[@yourstruly4817]

Me too, from a 90s book about dinosaurs

[@Dragrath1]

@@unexpected2475 Just like Hippos they may eat plants but you don't want to mess with hippos same for Elephants rhinos bison etc. "Herbivore" definitely doesn't necessarily mean passive or peaceful

[@ProcyonDei]

Not gonna lie, Deinocherius actually looks frigging awesome. Would love to see it added to ARK.

[@StonedtotheBones13]

I really like the colorful version of it

[@motorcitymangababe]

Yes!

[@tieri6313]

I thought EXACTLY the same!

[@KSWfarms]

Yes! I'd love to add one to my dino herd on Ark! xD

[@dezember25th]

@@KSWfarms Get a Therizinosaurus. They're closely related to Deinocheirus and have been in the game for years now

[@nekitamocika7673]

Everybody gangsta till Deinocheirus flexes his claws

[@FirstDagger]

Or her.

[@tscream80]

But even he has to feel a little jeally when Therizinosaurus shows up to the party. :)

[@nekitamocika7673]

@@tscream80 *oh you mean that turtle*

[@littlemrpinkness295]

@@tscream80 I goggled that, and Good Grief! It's aarrmmss! I wonder why some have those aaarrrmmmsss, and some have T-Rex stubs?

[@luke769animations]

FROM BEYOND THE GRAVE

[@ciarangrace1425]

One of my favourite dinobois, remember hearing about the arms as a kid. Years later, so happy to rediscovery it and find out it's a giant duck-monster. Excellent.

[@coreytaylor447]

normal Cinderella; normal, boring, small, glass slipper dino cinderella; exiting, exotic, massive, bone instead of slipper, was kidnapped and decapitated for a while

[@jimtru8048]

Well actually that's an ACTUAL book that I read in elementary school. It's called "dinorella" (clever I know)

[@altGoolam]

It's weird how the "trader" and the "poacher" are treated differently. They're basically in business together.

[@RabidlyTaboo]

one pays for a license and a degree. the other is a trader XD

[@zohabaig6426]

I think it’s because the traders are needed to get fossils from the poachers to actual paleontologists, since poachers don’t do business with paleontologists directly

[@mmcat2863]

@@zohabaig6426 traders aren’t the only source of archeologist let alone the favoured source for them. Poached fossils get sold to private collectors, when those aren’t interested, traders turn to scientists

[@zohabaig6426]

@@mmcat2863 no what I meant is, if a fossil is taken by a poacher, the only way for it to find its way to a paleontologist is a trader. I’m sure paleontologists don’t prefer to trade with them!

[@sorrenblitz805]

Depends on the individual. In this case it seems like the Trader in question didn't have any idea these bones were stolen decades earlier.

[@langitsamodra5904]

Tarbosaurus: we got big teeth and we're gonna eat yo- Deinocheirus: *flexes arms* do you even lift, bro? Tarbosaurus: *runs away in shame*

[@jamesmendoza456]

You lost subscrib

[@jaisonfire1]

@Berzerk Therizinosaurus was smaller then Deinocheirus and its claws were most likely not used for the same reasons.

[@prestonang8216]

Deinocheirus : Ey bro don’t attack me Tarbosaurus : nahh Can we get an F in the chat

[@lauraljeskey5987]

@@jaisonfire1 Theri was larger than a tyrant, i'm pretty sure theri was bigger...

[@jaisonfire1]

@@lauraljeskey5987 Therizinosaurus onky weighed 4.5 tonnes. Tyrannosaurus weighed around 8. Tyrannosaurus was much larger.

[@btd5311]

I believe you answsered the sail question yourself... 11:25 "seasonal floodplain home" therefor it had to store the fat somewhere.

[@cthulhufhtagn2483]

I have an image of Deinocheirus as Cinderella and I don't know how I feel about it.

[@adm0iii]

Someone please make that movie.

[@KRJayster]

You'll feel even worse when you realize that Deinocheirus fits the same meter as the word "Cinderella." *hums The Work Song from Disney's Cinderella* Deinocheirus, Deinocheirus, just the arms of Deinocheirus, Broken body, stolen fossils, head lost somewhere, missing toe bone…

[@coolboy2153]

Bear Mro I could totally see that actually! A Titanic-esque movie about the journey the skeleton went through from being discovered and scavenged, to pinballing all over the world in fragments, to the toe being returned and skeleton reunited! Once the whole picture (IE skeleton) is complete, the movie ends with a short flick about the life of Deinocheirus, possibly ending with an artistic interpretation of that specific specimen’s death. I dunno about you, but I would watch a movie/documentary like that!

[@nelassal1]

Imagine how the Dino feels about it 😂

[@cthulhufhtagn2483]

@@coolboy2153 Oh, 100%!

[@uriwolkowski5042]

This is my new favourite Eons episode. The mystery and rediscovery of Deinocheirus is possibly the most epic fossil story of the century, and this video captures this very well. Terrific job.

[@dumoulin11]

The most enigmatic organism ever mentioned in these videos is Steve.

[@LeatherNeck1833]

He's always there! LOL "Thanks to this month's Eontologists: someone, whoever, them, you over there, and STEVE."

[@NoArtisticLimitation]

Steve is an icon. I don’t know why but hearing about Steve excites me

[@augustlandmesser1520]

I imagine Steve as Rudy (Ice Age 3).

[@strongindependentblackwoma1887]

who is steven?

[@sneakysnake7695]

Watched their latest video before this and I'm glad to say Steve is still thriving

[@nekkidnora]

This is probably one of the most fascinating episodes yet, I loved this!

[@cthulhufhtagn2483]

Well, that was a fast start.

[@QuestionableObject]

Thought I'd missed an intro or something

[@cthulhufhtagn2483]

@@QuestionableObject Right?

[@garrybagula6292]

))@@cthulhufhtagn2483 ?

[@cthulhufhtagn2483]

@@garrybagula6292 Have they fixed it?

[@mau_kacang]

@@cthulhufhtagn2483 idk.

[@angryozziebogan3046]

Tyrannosaurus: "Ornithomimus, get in my belly!' Deinocheirus: "You what?"

[@somethingsomething7330]

Gotta love Steve for supporting so much this show

[@mattrogers5188]

* supporting this show so much

[@theandromedaeffect979]

The sail is so that he can run around his friends screaming “hUMP DAY”

[@ablebaker8664]

Abstract: Large features tend to be resource expensive. It seems unlikely that the sail feature didn't evolve as a single solution to multiple selection pressures. Hypothesis: A large mass on its back would raise its center of mass but would also add an inertial counterweight to its stride. Each leg would have a stabilizing load that could increase the efficiency of its range of motion in forward motion,. Fat storage would provide buoyancy, but whereas belly fat and hip and thigh pads would provide lower center of mass and better agility in a terrestrial environment, having a flotation device under you would tend to flip you over... Where having the same buoyancy above your center of mass, would tend to keep you upright. It may also have served to increase the keel area of the dinoceirus while swimming, improving paddling efficiency. It evidently lived in an environment that would have exposed it to both the risks and benefits of a semi-aquatic life. It is most probable then that the sail feature evolved as a best-compromise between the almost mutually contradictory selection pressures of terrestrial and aquatic environments with presence, size and location of the sail serving different advantageous functions for each.

[@HappyBeezerStudios]

And when you already have sail, why not make it fancy during mating season.

[@pupyfan69]

@Craig Carmichael counterpoint: bison, dimetrodon, edaphosaurus

[@justsomeguy3172]

Which it then could have used to intimidate predators and attract mates

[@Onodera1980]

The hump was clearly for humans to ride.

[@user-xu8gt4ob2o]

OBVIOUSLY🙄

[@Cadspinnerswife]

or to be HUMPED on, okay i'm sorry my humor sucks

[@grim7298]

Of course not, is because it was an old ornithomimus 🙄

[@brandonforrester7342]

Bruh 🙄

[@acapulcogoldpablo8096]

It always blows my mind that these creatures existed at some point in time. Amazing!

[@docinabox258]

Acapulco Gold Pablo Picturing these things walking around, and moving gives me the chills. I don’t think they would have looked so scary though. Just like big birds, but that doesn’t mean I don’t think they would obliterate me in five seconds.

[@toridomiart7092]

I love love love that Eons acknowledges all the social and cultural influences and events that go into teaching about one dino. It makes for such better, more enthralling videos, and helps demystify so much that goes into how history is told & who tells it.

[@TheSaneHatter]

Deinocheirus: my favorite dino-mystery! It was featured so prominently in many of my childhood dinosaur books, at a time when we only had its forelimbs. This creature gave a new meaning to the phrase, "well-armed."

[@katlawliss9496]

I would love it if Eons would make a video about the science of fossils... how they form, why certain bones get lost, and who even owns a newly discovered specimen?

[@pixagi]

This video seems to start very abruptly in the middle of a statement.

[@adm0iii]

--bly as a possible explanation.

[@needfoolthings]

Her way of speaking and her cadence have this effect on me anytime anyhow...

[@SachinShukla]

This is amazing. I had no idea this mystery had been solved.

[@thedoruk6324]

Turns out the omnivore frankestein's monster actually had badass murder *claws*

[@rossjennings4755]

Turns out the badass murder claws had an omnivore Frankenstein's monster, more like.

[@barsyelken2518]

Seni heryerde görmeye başladım ne bu hız :D

[@Triceratops98]

I call it the satanic duck

[@adriendm]

I really like her, her voice is gentle and nice to listen to ^^

[@pivotchampion]

Just passing through to give my thanks to Steve

[@Vernardo]

Yup, this guy really appreciate the opportunity to help keep the show going!

[@a-s-greig]

Before even clicking the thumbnail, I knew it was Deinocheirus. The thing's absolutely insane.

[@hollyodii5969]

Deinocheirus was a weirdo for sure. Thank you Eons for bringing us the fossil discovery back story of this fantastic creature. This episode was brilliant!

[@snowlynx1585]

It probably survived longer than humans ever will. And there were lots of dinosaurs that looked like it too. Actually, as of now, humans and elephants are actually some of the weirdest animals because it's the only surviving member of its family

[@TommoCarroll]

Well gastroliths are incredible! Amazing to think of birds (and these dinos) chowing down on rocks!

[@nickdknez]

I remember all of the old out dated depictions of this giant in my dinosaur books growing up, from mega super predator to plus sized therizinosaur and finally to the biggest and strangest ornithomimosaur of them..well at least so far anyway

[@aname4048]

I think my favorite part about these videos is the very end where she’s naming all the people who helped with the video “and Steve” love that

[@LarryThePhotoGuy]

Who is Ng?

[@pokoirlyase5931]

I saw those arms at the New York Natiral History Museum and I was awe-struck

[@chheinrich8486]

And now deinocheirus is finally in a documentary, prehistoric planet

[@wilhelmtan5301]

it is so satisfying watching it scratch its side

[@Rexred09]

It was in Bizzare Dinosaurs and Amazing dino world before that z

[@ericsuarez834]

"Like a dinosaur cinderella" omg I love you!

[@Coprolite19]

I figured the sail would've been for large muscle attachments for those large arms

[@hoidthings5728]

Just arms fossil: Deinocheirus Surprisingly perfectly matching bones from two different sources: Deino-CHEER-UPS

[@neilsanghvi5229]

Thanks!

[@calebeliason9067]

Some people say that the sails on spinosaurs were for making a shadow to attract fish like modern day birds do with their wings.

[@PaulOConnellthePOW]

I didn't know that. How interesting

[@CroissantFromarsch]

Could you elaborate on why this would attract fish? If anything I would believe that a shadow scares away fish as they would think it belongs to a predator above the water (?)

[@ohohgreasy660]

@@CroissantFromarsch curiosity

[@WildFyreful]

@@CroissantFromarsch I believe what he is alluding to with this theory is a hunting strategy some wading birds (like herons) use called tent-fishing. The point is for the shadow of the wings to not only reduce sun glare, but fool the fish into thinking the shade is a safe place to hide.

[@dakotakavana]

yo thats cool asf thanks

[@mikeofcetacea]

I'm curious about the sail. It's interesting that the Spinosaurids, Deinocheirus, and some Hadrosaurs shared humped/sail backs. Is it possible it's an adaptation related to their semi-aquatic lifestyles?

[@JohnDrummondPhoto]

My guess about the sail: it would have made Deinocheirus look even bigger from the side, which would have been good for intimidating predators. Its claws and long arms would be useful for defense as it would otherwise be very vulnerable.

[@burnish8670]

We had a set of encyclopedia published in the very late 80's about dinosaurs that I would read as a kid and this one always fascinated me because all we knew of it was it's hands and it was speculated, in those books, to be a terrifying predator that was bigger then T-Rex. So finding this out is really neat.

[@Cyndiblu]

*sees giant claws* D: *being obliterated by ark therizinosaurus flashbacks*

[@chancegivens9390]

I know man I know I have flashbacks of allosaurus big like a rex the only difference is you can't run away from them that and they run in packs they tormented me in my early years of playing Ark I even made a giant wall to keep them specifically out but alas they always found ways to break in.

[@ihh2921]

Or the isle when theri was first introduced

[@crystalm8290]

Me: *builds stone taming pen* Therizino: Allow me to introduce myself

[@Aaroncoop9162]

Ark 😭

[@wannabewyvern]

*cries in I feel you*

[@Reiscakee]

Man, I love this channel more than my life.

[@theredeft5319]

Woah when I was in middle school many years ago I got a huge encyclopedia of all known dinosaurs at the time and I remember Deniocheirus very well as I was fascinated by what the creature looked like that we only had the arms of. I never heard this story and it’s really cool to see what it looked like now

[@madhupanicker2669]

First of all, I just want to say I love watching Eons, Great job team. 2:35 Correct me if I am wrong, isn't it the other way around? "The left arm is missing the claws and the right arm is fully complete"

[@slwrabbits]

Unless someone flipped the image, or if for some bizarre reason it was originally a mirror image, yes. That threw me for a long time, too.

[@AshsPikachu101]

PBS eons never fails to teach and entertain. Love you guys! Im almost 19 and I absolutely love this channel😂 i love that I can show my little brother and he'll understand well, keep up the good work guys :)

[@PierresWildAdventure]

I’ve wondered about those hands my whole life. Thanks for finally answering that question

[@KarmaTheCat]

I love this channel, it is very educational and I love learning on this channel ♥️

[@Tigerbythetoe]

Really interesting video! I just really enjoy it when a mystery like this, given time and the effort of dedicated scientists, leads to an answer. It’s really a testament to the hard work that paleontologists put into solving the many puzzles that are left behind by fossils. We live in an amazing age of discovery! Thanks to EONS for helping to share and educate the world in a way that we all can understand. Really great stuff!

[@zooemperor3954]

Ornithomimus means bird mimic! Struthiomimus means Ostrich mimic.

[@simoncopar2512]

Exactly! Also, judging by the number of comments confused by the word "mimic" in relation to which animal came first, it would be better to translate it to "bird-like".

[@jaisanatanrashtra7035]

Gallimimus means chicken mimic

[@Crakinator]

I remember when I was like 12 or so I had this book called something like “Dinosaur record breakers”. It repped all the biggest, fastest, ‘scariest’, most famous, etc. rendered in terrible 3D, and I remember one of the records was ‘most mysterious’. That one was held by Deinocheirus, which was represented as a giant dromaeosaurid-looking carnivore. I think the modern understanding of Deinocheirus is much cooler.

[@cadbanesfavoritehat5655]

Same! I still have that book with me! It basically looks like an oversized, naked Gallimimus, lol!

[@fuzzlenutberry]

The sail is used to swim through space. Dinosaurs never went extinct, they just left the planet during the beginning of the ice age to find food.

[@thattonekid2842]

Lololol

[@Elios0000]

some one already did it in the 80's lol kzbin.info/www/bejne/naqal4Jonp6sb5Y

[@toils8722]

Facts

[@Prof.Megamind.thinks.about.it.]

Nah... ! It's similar to the way camel humps function ; it provided much needed water and nutrition during the seasonal hard times , and insulation against the extreme heat and cold the dinosaur was exposed to in that temperate-zone flood-plain environment . It may also have been a supporting structure for a muscle-set which Deinocheirus used to sweep it's head through the water constantly , ingesting both plants and fish as it did so .

[@ariantanjim9107]

@@Prof.Megamind.thinks.about.it. r/woosh

[@bayumarsal9687]

Finally, after wondering for years (since I was a kid), now I know what a Deinocheirus looks like. The dinosaur cards collection I had before only have the illustration of a pair of claws. This video explains a lot info to me. Thanks PBS Eons...

[@zoied6008]

Thank you for letting me know this,You guys are awesome!

[@turbinesurgeon6470]

@EonsShow I was wondering if it would be possible to do an episode on the difference between avian and non-avian dinosaurs. Are we talking the Aves and the Aves-nots or what? Ahahaha, leave me alone it was 3 in the morning. You have skimmed this subject many times, but it would be cool to learn what really are the things that define each, and where/when they split, etc..

[@dxubty]

Now all my dinosaur encyclopedias from when I was little are obsolete lmao, bruh moment for the those who thought of it as some massive Therizinasaurid or Maniraptor

[@cintronproductions9430]

Yeah, same. I have that famous dinosaur book with the Luis Rey artwork, and in it Deinocherus is basically censored and they only show its claws and feet. At least they correctly classed it as an Ornithomimid. Also, many, many more dinosaur books are now obsolete for another different reason. RIP Troodon. F*ck Stenonychosaurus.

[@vincentx2850]

That's... pretty close for a guess actually...

[@ScionStorm1]

I collected all those DK dinosaur books back in the 90s. I used to read them like it was a Pokedex. Lol

[@shasan2393]

Cintrón Productions wow, troodon being defunct is news to me! I remember reading as a kid that troodon might have been one of the most intelligent dinosaurs. Thanks, for getting me up to date!

[@dxubty]

Cintrón Productions What Troodon??? What happened? I never heard this? So Troodon didn’t exist? Damn used to love that creature

[@WebkinzWor1d]

The scale shown in this is a great visualization!

[@OmegaWolf747]

When I was a kid, I pictured deinochirus being like a giant dromeosaur and shivered. Now I can just snicker at the poor thing.

[@ScionStorm1]

On the plus side, it has the perfect face to make sock puppets out of.

[@Hotchpotchsoup]

Poor thing? It was a badass surviving in the midst of tarbosaurs! I think it looks exotic, original and dangerous.

[@Tylwaa]

My grandfather was born in the 1890s (yes I'm old!) and as most farmers never finished school but maybe 6th grade. But smart. Every year at about the same time, a beautiful, large blue heron would rest on a fence post on the farm, 1-2 days. I asked Grandpa why and he said, "Maybe, millions of years ago, this land was all under water and he's still drawn here." Wow! I didn't think my grandpa ever thought like that. Amazing things I learned from my Grandfather.

[@nasr7341]

It's hard to grasp that something like this ever lived, wow.

[@kingofbruhssia4639]

11:00 indeed bisons have spines that look like sail, so we should rename it to SPINOTAURUS

[@JogBird]

i wonder if some future species will do something like this for humans

[@krizkatz1574]

"And we determined that these bones are human because of the fossilized Nokia phone we found nearby." - Future Species Paleontologists probably

[@VictoriaFaye09]

It feels so basic, but I can never get over the scale of everything back then. Our scale is so, so small in comparison!

[@TommoCarroll]

Completely agree! But I also forget how HUGE Africa Elephants are too! I've only ever seen one from afar in a (very well run) zoo, but even at a distance you could tell they were bohemoths!

[@pepesylvia848]

Yeah but we're still giant compared to 99% of known life, so it's not that weird that stuff is occasionally bigger than us

[@llabronco]

Fantastic episode, this is why I love his channel!

[@dannya1854]

I remember seeing just the arms being shone in dinosaur books when I was a kid and thinking it must have been a terrifying predator. It's certainly not what I expected it to look like.

[@daneroberts1996]

I liked this episode, solving scientific cold cases gets me every time

[@mochibxby2260]

can we please bring this back to life its so beautiful

[@simmerdownow5744]

Next video should be on the biggest mystery in the PBS Eons world: who is Steve???

[@Salamonereefs]

I think the sail on the backs of many of these dinosaurs was to allow such large animals to keep their shape properly without straining themselves too much, being so large there is a lot of weight falling forward when walking on two legs, having such a large back kept these animals healthy by allowing for more muscle to anchor to the bones.

[@kairon156]

I think you got the left and right between the picture and the arm/hand location on the creature mixed up. It's right arm looks like it has claws and it's left doesn't.

[@pansepot1490]

Perhaps they flipped the photo.

[@kairon156]

​@@pansepot1490 hummm... It's possible but that means the person who did the photo/video editing should have spotted it. It's only a minor annoyance but something I felt the need to point out.

[@hominid92]

@@pansepot1490 I thought they must have flipped the photo too. I think they add pictures after writing the episode so it's more probable that the error is in the picture.

[@HeavyMetalle]

Well you had said the deinocheirus’ habitat was primarily the marshland areas of seasonal floodplains; the first reason for the hump comes to mind with that: that the hump was, much like the humps of modern camels, a reserve for nutrients, fats, water, etc.. For such a large dino, this would help offset its consumption during floodplain positive times versus floodplain negative times. This hypothesis does make me curious about its seasonal behavior changes.

[@way-13]

My gf “there’s long then there’s LLOONNGG”

[@BradShreds]

Hit way too deep

[@ryugo7713]

YOU GON LEARN TODAY

[@Ilikeavocados123]

😂😂

[@chopun3862]

You wish

[@FantikSalmakii]

Deinocheius is my favourite dino,and watching videos about him makes my heart feel warm

[@octaviabugg9616]

Love this episode; Deinocheirus is my second favorite dinosaur!

[@hackman669]

Eastern dinos are very different than their western cousins. Wonder what they will find next.

[@catherineklabouch6872]

I was always captivated by the mystery of "Horrible Hands" from visiting the Museum of Natural History in NYC. What a fantastic conclusion. Thank you for making this video ❤

[@Gongasoso]

I think it depends on the "sail". Some might be anchor points for big muscles, others for fat deposits, others for display... Don't fossils sometimes reveal that, like signs of ligament attachment?

[@j3tztbassman123]

Those dorsal spines could very well be muscle attachment points. The sharp forward claws could have been used defensively, same for the blunted hind claws.

[@birbcall5778]

Yesss, my favo dinosaur!!! I think those extending "spines" on the hip where for a hump, since bisons have proportionally the same length of "spines" on their back, and tbey dont have a sail. It is also the plave where the hump is, its above the hip. So thats why i think it rather was a humb than a sail

[@davidschaftenaar6530]

I'd say the sail was probably for thermoregulation and buoyancy in the water, that's probably the reason all three dinosaurs that had sails were aquatic. Water is far more thermally conductive than air, so if you're big and you live in warm shallow water most of the time, overheating can become a problem. Being able to float more easily might help a heavy animal swim and help prevent it from getting stuck in the mud.

[@kevinlu9339]

I think the sail may have helped it swim better or gain buoyancy. It could’ve been a semi-aquatic dinosaur, and the hand/claws would’ve helped it reach the riverbed easier. The feet being squared off could suggest it was a strong paddler

[@Imperiused]

I learned something. Previously to this video I thought Deinocheirus was a Therizinosaur, not an Ornithomimidae. Thanks for clearing up this mistaken idea I had!

[@biglil771]

Could you please do a video on African mega fauna like the Natodomeri lion, Palaeoloxodon Recki, Pelorovis Antiquus, Sivatherium Giganteum, the Xenocyon subgenus. Please respond eons so I could sleep at night.

[@gygy2095]

YESSS extinct african mega-fauna really doesn't get much attention

[@natodomerilion5392]

We need this eons please

[@biggay8140]

Never heard of any of these creatures but would love to see eons shed some light on these giant beasts.

[@biglil771]

Additional information on the Natodomeri lion as it is relatively unknown. The Natodomeri lion had a basal length of +380mm at minimum and since the condylobasal skull length is normally 25-35mm longer than the basal length an estimation of +410mm for the condylobasal length would be reasonable and thus the greatest skull length would probably be +460mm making it equivalent to the largest cave lions both in America and Europe and possibly even surpassing them.

[@biggay8140]

@@biglil771 Interesting, you would have thought the cave lions were the biggest but hey what do you know Africa holds the largest lions.

[@Monoman2345]

Wow I remember being a kid and always learning about those arms. I can look back in old dinosaur books of mine now and see how different it was drawn, when we only knew the arms!

[@dinoh5538]

Talk about the *Giant Crinoid Rafts of Holzmaden* ! PD: Awesome video

[@societysmostambiguousgirlb1495]

This!

[@crazycatlady39]

11:55 I would guess that the sail is for muscle attachments for the back and hips. To make a stronger back and legs to better support it's body while moving about.