How & What Animals Eat: Crash Course Zoology #4

[@georginachard8604]

Crash course never fails, always so educational and fun and entertaining to watch.

[@ireallyhatemakingupnamesfo1758]

I’m a computer Science major, but I love the high level overviews these videos provide

[@aaronb.6724]

I'd bet that most people are here just because this stuff is super interesting, not for a specific class

[@brysonklein5045]

Yes

[@QuestionYourWorld]

Which is awesome. To think that this level of information used to be inaccessible to people. Whether their local library didn't have it or no one around them had this information. It's great to see that there are everyday people, living everyday lives, who are interested in furthering their understanding of things.

[@thearchitects3055]

Yep

[@epauletshark3793]

That's why I'm here.

[@osmia]

+

[@alonealien1474]

Ugh that lamprey mouth! I cannot unsee it now. Creatures like eels and lampreys freak me out!

[@daylight1845]

I dissected one in my zoo lab last semester and I can confirm it's even more unsettling in person

[@biosavat9475]

Lol they look strange but I don't see why they freak u out

[@biosavat9475]

But I'm really fascinated by their unique adaptation

[@alonealien1474]

@@daylight1845 Okay, so, my worst nightmares come true. 😑 Sounds about right.

[@Twinblade34]

"Basically every human has poop-filled mites on their skin". I could do without that information...

[@kailawkamo1568]

Quarantine remote learning serverely watered down my experience when I was studying zoology as a subject. I'm glad this channel exists.

[@muhmalikali]

You provide a very good understanding of zoology, thank you. And thank you for uploading videos about this regularly.

[@drsingingeagle]

Anyone else remember when Spongebob tried filter feeding?

[@AphidKirby]

He does in the episode "Feral Friends"! where he turns into an actual realistic sponge

[@NamanKumar-vp3ze]

You guys have cool videos and helped me not fail.

[@wow2926]

I am literally obsessed with zoology. This is going to be so fun

[@harayaespadrilles6108]

Gaah. I love the host! Her voice is super calm and unique.

[@LordOfNothingreally]

I'd be interested to learn more about taste and tastebuds. I've always wondered what animals think about their food, or whether they enjoy it. If animals DON'T really "taste" their food, then why do we?

[@ArkaSaurusRex218]

Wait, then how did the prey of the first carnivore gained nutrients?!

[@alexanderofrhodes9622]

The first animal was forced to eat either plants or bacteria. So however those two things get their nutrients

[@shyambhavi10]

That prey must have been autotrophic and hence made its own food with the help of inorganic materials

[@halforest1118]

Algae are older than plants, so most likely them.

[@ociorel]

From other organisms

[@ben9579]

probably from eating protocists, or bacteria

[@ianrbuck]

Well, I could have lived the rest of my life without knowing that eyelash mites exist.

[@justcallmeSheriff]

I got to meet E. O. Wilson during my master's in a benthic ecology lab, so this episode was amazing for me!

[@Beryllahawk]

Well. I'm glad I had just finished breakfast BEFORE watching this, haha! Very interesting video, I am liking this series a whole lot already!

[@feldar]

How are the percentages of carnivores herbivores calculated? Is that percent of species, percent of organisms, percent of biomass or some other measurement?

[@SpiderdayNightLive]

Its percent of species! That's usually what we use unless otherwise noted. If you want to learn more, this is the paper we used: onlinelibrary.wiley.com/doi/full/10.1002/evl3.127

[@فوفو-ز7و]

I liked this video...thank you so much

[@CMZneu]

4:37 "...and has very few nutrients and calories" Isn't wood technically high in caloric energy? If animals can't extract it all that's another matter.

[@ArkaSaurusRex218]

Also, its surprising that so little omnivores exists. Thought it makes sense. How many omnivores can you name?

Us and dogs. Bears. Pigs, I guess. Chicken? We are family...

[@halforest1118]

Considering the number of animals that seem herbivorous and actually eat other animals or parts of them (like giraffes chewing bones) for mineral suppliments, quite a few. I wonder if they counted them as just herbivores?

[@ociorel]

4:09 Explains why

[@Cillana]

Quite a lot of birds eat both insects and seeds

[@n.riftfit]

YAY ZOOLOGY!

[@6996katmom]

Thanks for talking slower than the others. I can understand you. Thanks for sharing and have a Blessed Day!

[@tinytarakeet]

loving the zoology series so far!!

[@donsample1002]

Umm...animals just eating other animals doesn't work, from a thermodynamics point of view. There has to be something at the base of the food chain that is getting its energy from some other source--sunlight, geothermal, or something.

[@azrielmoha6877]

What's exactly your point? What you said true, that's why there's plants or sulphur eating bacteria. But how's that any relevant to the video?

[@colewyeth5497]

@@azrielmoha6877 because the video said that carnivorous animals originated before plant eaters.

[@donsample1002]

Azriel Moha 2:20 "Animal eating animals ... probably evolved long before plant eating animals"

[@sobasicallyimgoated]

i love this series thank you thank you!!

[@mtvtutoring]

I am pretty knowledgeable on this subject (I make videos on anatomy and cellular biology) but I still learned so much on this video lol. Good work!

[@AmbiDai]

i'm captivated, learning more about how we come to eat.

[@luisagf1385]

Hold up, you're telling me that I have mites in my eyelashes?? XP

[@warricklow4218]

dont search it

[@richardshort2001]

and when they die in your eye, they have all the poop they ever made inside them still.

[@SaifHindawy]

Thank you for another amazing informative video. Can you please put a list of references? I would like to get that 2019 study specifically.

[@unepommeverte17]

oof that phylogenetic tree. i definitely wrote a paper for invertebrate zoology class in college arguing that porifera is more basal than ctenophora lol oh well

[@JesusMartinez-rr2ry]

It feels weird that carnivory is much more ancient and common throughout the animal kingdom, since the food chain has to be linked somehow and we can't just have producers and consumers operate separately.

[@warricklow4218]

True but she was only talking about plants. There's other producers like cyanobacteria, chemoautotrophs and other photoautotrophs that evolved before plants that supplied the food chain.

[@gildedbear5355]

I mean, if you're made of meat then it makes sense to eat other things that are already made of meat 8D Kind of like snakes: if you're a noodle with a head then the optimum shape of food is also noodle shaped (the head is optional)

[@SelectHawk]

How could animals exclusively eat other animals, originally? Unless there was outside resources coming in from somewhere, wouldn't our ancestors have run out of energy and nutrients?

[@alexanderofrhodes9622]

The first animal would have ate either plants or more likely bacteria

[@ociorel]

Not all organisms were animals in that time

[@biosavat9475]

Yeah they were microorganisms not exactly animals at that time

[@warricklow4218]

nutrients got passed up the food chain from photosynthesizing bacteria and protists. There's also chemoautotrophs that can supply food chains.

[@feldar]

never thought of a squirrel as a predator before

[@richardshort2001]

Wait, if the first animal was a carnivore, what did it eat?

[@turbinesurgeon6470]

That wink was perfectly executed, I had to pause the video for a minute.

[@stax6092]

I find it hard to believe that the first animal ever started by eating animals, because it can't be the start and eat others of it's kind. Like, wouldn't eating other animals have to start long after the first animal?

[@danielpaz7696]

wait this isn't eons?

[@Confuzledish]

Boop

[@yusiff]

How can we say "to eat" in a scientific way?

[@georginachard8604]

monch

[@austinfreyrikrw6651]

There are nouns/suffixes such as phage or troph. E.g. bacteriophage (a bacteria eater, a type of virus) and heterotroph (other eater, i.e., animals). But as a verb, I don't know.

[@alexanderofrhodes9622]

The Greek word for eat is Troei , so you could use the form Trone for 'do eat'

[@felipearenasbarr]

Do you guys have human biology in this channel too?

[@austinfreyrikrw6651]

Well, there is Crash Course Anatomy & Physiology. kzbin.info/www/bejne/q3OqnWV4qs-ehrM

[@himanshuusain]

Thankyou

[@unclebobo6030]

Hi how’s it going watching from broomfield Colorado

[@roberthfagundes4013]

Thanks.

[@1.4142]

Do lamprey help eliminate invasive asian carp?

[@CSHallo]

Does anyone else miss Stan? Although, the hosts not named John Green are also great.

[@michealwestfall8544]

Isn't it possible that predation evolved more than once and that it happened so long ago that it's too hard to tell.

[@Cillana]

It's probably because plants are harder to digest

[@Tooupi]

12:33 yup, time to wash face for no apparent reason

[@DracarmenWinterspring]

2:23 - I don't get it, how could carnivores, in the sense of animals eating other animals, exist for generations before animals eating other things? That would be like a species surviving on nothing but cannibalism, like a biological perpetual motion machine... Did you mean the first animals were (at least partially) eating other microorganisms that weren't plants?

[@warricklow4218]

All she said was carnivory evolved before herbivory. Proto-animals and early animals ate other microorganisms and each other, just not plants.

[@awesomecraftstudio]

Wait, If for a time there were only carnivores, what did the carnivore at the bottom of the food chain eat?

[@hunterG60k]

Thanks for reminding me that eyelash mites exist 😒

[@richardlehoux]

Why bones are not classified as carnivore food and wood has herbivore food?

[@vnasty2529]

It takes much more energy to move and hunt for prey rather then to use photosynthesis. Plants had to come first before carnivores... How is evolution gonna go out of order from the food chain fam....

[@donsample1002]

And animals just eating other animals doesn't work. There has to be something getting its energy from some other source at the base of your food chain, or it just collapses.

[@Summer-rj9ms]

Did you watch the video

[@ociorel]

@@donsample1002 What about other organisms that aren't animals? And plants couldn't come first because the first plant was before (I think) the first animal

[@curmudgeon7217]

How did carnivores evolve before herbivores?

[@naathcousins4658]

If all animals ate animals what's at the bottom of the food chain?

[@trevinbeattie4888]

Now I have a hankering for fettucini alfredo. :D

[@philipph.4903]

Dear Crash Course team, I really love your zoology content but I simply can't enjoy it (or even watch it anymore) because of always being in panic when there is a cut and the next thing you could possibly look at is a spider. I know there are many people out there that feel the same because they have a very strong arachnophobia. I guess it is hard for other people to relate but it is less a feeling of uncomfortness seeing a spider than rather a very strong, deep rooting fear that is that immense that people like myself can't even touch a book when they know there is a picture of a spider in there. So may I ask you very kindly to remove spiders from your videos or (probably the easier way) to include time stamps in the description that mark the occurence of a spider? I would be very grateful and I think it is a highly underrated problem in the whole internet in general. It can be difficult to protect every phobic but there are strong tendencies to specific types of phobias, so at least the more common ones (like the spiders) could be handled more sensitive in all kinds of media I think.

[@Summer-rj9ms]

Lol is this a joke? This is a zoology course bro

[@shep4184]

Ayo I learned about this last year in freshman year (college)

[@AutoHunter]

Hey you. Yes, you. The random person I would never meet. I truly hope that you would find happiness in life. Today is going to be a great day. blessings and love✍️💯♥️❤️♥️❤️

[@christonamtb4089]

🤮🤮🤮🤮🤮🤮

[@bsinita_wokeone]

Ah yes🤔 the art of eating 🍽the meticulous way of getting and consuming your resources by any means necessary but yet even with diet and exercise, I still can't fit into my old summer jeans. 😞👖

[@dorothyjohnson6497]

The amount of time we spend believing we can't is more than enough time to learn how we can.

[@1.4142]

Bone marrow is edible

[@QuitePerplexing]

Wow, This explains all those fish stuck to my skin.

[@manoiskee]

vegans have this illusion that carnivores do not exist, the vegan teacher should watch this, lol

[@pvtpain66k]

I don't get it. After you've digested it, it just becomes energy. /s

[@dustman96]

Wow, I'm unlearning the science behind eating watching this video. A lot of this isn't even correct.

[@losfreeborder5377]

The next shall be plastic eaters...

[@rizdalegend]

That audio segment... don't do that again

[@NamanKumar-vp3ze]

Hi

[@gregoryfenn1462]

The 🐍 🍽 🐀 image was a bit gross.. I know it’s natural but rodents are friendly pets. You wouldn’t show a dog getting eaten by a lion or a kitten being eaten by a wolf... great video though, very informative

[@anatypicallyhumanperson7200]

Most people don't view rodents that way. The vast majority see rodents, especially mice and rats, as disgusting pests and are unbothered by their deaths.

[@zydian_]

'Friendly pets' in YOUR opinion.

[@vnasty2529]

How can u say carnivores evolve before herbivores when life started as a single cellular organism in water? How can u develope into a multi cellular system without first learning out to generate energy photosynthetically first? Single cell organisms first slowly harnessed energy from sunlight, that way they could reproduce more cells without traveling distance. Plant life started MILLIONS of years before animal life, just single cell organisms developed before multi cellular ones.... Unsubscribe

[@SpiderdayNightLive]

While photosynthesis might seem simpler, because there is plenty of sunlight, it actually takes a lot of very complicated chemical reactions (and specialized proteins to do those reactions)! On the other hand, eating requires less complicated reactions, basically proteins that break up big things into smaller things. Its very very likely that the first life just grabbed whatever was nearby, even just non-living nutrients but also possibly other life, then broke it down for parts. And the first animals, which came about much later, very likely were carnivores, even if *their* ancestors might at some point had the ability to photosynthesize .

[@Craigwdlr]

Yea, na, I don't take your blanket assumption on evolution seriously.

[@rojka-_-]

First