How & What Animals Eat: Crash Course Zoology #4

Рет қаралды 116,004

Күн бұрын

Animals have evolved to eat a lot of different things, even stuff that barely passes for food, and it shapes our entire lives from what we look like to where we live. Today, we’ll talk about why being a carnivore is just easier than being a herbivore, why there are so few omnivores out there, and dedicate a little time to the remaining 2% of animals that really push the definition of food. So grab a snack because today’s episode is gonna make you hungry… well until we start talking about what happens to food after you’ve digested it. 💩
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Пікірлер: 127

@aaronb.6724 3 жыл бұрын

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

@brysonklein5045 3 жыл бұрын

Yes

@QuestionYourWorld 3 жыл бұрын

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 3 жыл бұрын

Yep

@epauletshark3793 3 жыл бұрын

That's why I'm here.

@osmia 3 жыл бұрын

@ireallyhatemakingupnamesfo1758 3 жыл бұрын

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

@georginachard8604 3 жыл бұрын

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

@alonealien1474 3 жыл бұрын

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

@daylight1845 3 жыл бұрын

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

@biosavat9475 3 жыл бұрын

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

@biosavat9475 3 жыл бұрын

But I'm really fascinated by their unique adaptation

@alonealien1474 3 жыл бұрын

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

@Twinblade34 3 жыл бұрын

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

@drsingingeagle 3 жыл бұрын

Anyone else remember when Spongebob tried filter feeding?

@AphidKirby 3 жыл бұрын

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

@muhmalikali 3 жыл бұрын

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

@kailawkamo1568 3 жыл бұрын

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

@LordOfNothingreally 3 жыл бұрын

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?

@wow2926 3 жыл бұрын

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

@harayaespadrilles6108 3 жыл бұрын

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

@NamanKumar-vp3ze 3 жыл бұрын

You guys have cool videos and helped me not fail.

@ArkaSaurusRex218 3 жыл бұрын

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

@alexanderofrhodes9622 3 жыл бұрын

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

@shyambhavi10 3 жыл бұрын

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

@halforest1118 3 жыл бұрын

Algae are older than plants, so most likely them.

@ociorel 3 жыл бұрын

From other organisms

@ben9579 3 жыл бұрын

probably from eating protocists, or bacteria

@user-wj4ov5ot6d 3 жыл бұрын

I liked this video...thank you so much

@ianrbuck 3 жыл бұрын

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

@feldar 3 жыл бұрын

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

@SpiderdayNightLive 3 жыл бұрын

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

@Beryllahawk 3 жыл бұрын

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!

@justcallmeSheriff 3 жыл бұрын

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

@ArkaSaurusRex218 3 жыл бұрын

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

3 жыл бұрын

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

@halforest1118 3 жыл бұрын

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 3 жыл бұрын

4:09 Explains why

@Cillana 3 жыл бұрын

Quite a lot of birds eat both insects and seeds

@n.riftfit 3 жыл бұрын

YAY ZOOLOGY!

@tinytarakeet 3 жыл бұрын

loving the zoology series so far!!

@mattvaughan3109 3 жыл бұрын

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!

@JesusMartinez-rr2ry 3 жыл бұрын

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 3 жыл бұрын

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.

@sobasicallyimgoated 3 жыл бұрын

i love this series thank you thank you!!

@SaifHindawy 3 жыл бұрын

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

@donsample1002 3 жыл бұрын

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 3 жыл бұрын

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 3 жыл бұрын

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

@donsample1002 3 жыл бұрын

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

@AmbiDai 3 жыл бұрын

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

@6996katmom 3 жыл бұрын

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

@CMZneu 3 жыл бұрын

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.

@turbinesurgeon6470 3 жыл бұрын

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

@SelectHawk 3 жыл бұрын

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 3 жыл бұрын

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

@ociorel 3 жыл бұрын

Not all organisms were animals in that time

@biosavat9475 3 жыл бұрын

Yeah they were microorganisms not exactly animals at that time

@warricklow4218 3 жыл бұрын

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

@luisagf1385 3 жыл бұрын

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

@warricklow4218 3 жыл бұрын

dont search it

@richardshort2001 3 жыл бұрын

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

@himanshuusain 3 жыл бұрын

Thankyou

@unepommeverte17 3 жыл бұрын

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

@feldar 3 жыл бұрын

never thought of a squirrel as a predator before

@roberthfagundes4013 3 жыл бұрын

Thanks.

@gildedbear5355 3 жыл бұрын

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)

@richardshort2001 3 жыл бұрын

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

@michealwestfall8544 3 жыл бұрын

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 3 жыл бұрын

It's probably because plants are harder to digest

@Confuzledish 3 жыл бұрын

Boop

@unclebobo6030 3 жыл бұрын

Hi how’s it going watching from broomfield Colorado

@felipearenasbarr 3 жыл бұрын

Do you guys have human biology in this channel too?

@austinfreyrikrw6651 3 жыл бұрын

Well, there is Crash Course Anatomy & Physiology. kzfaq.info/get/bejne/q6h3n5Vz2tDPgIU.html

@CSHallo 3 жыл бұрын

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

@trevinbeattie4888 3 жыл бұрын

Now I have a hankering for fettucini alfredo. :D

@yusiff 3 жыл бұрын

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

@georginachard8604 3 жыл бұрын

monch

@austinfreyrikrw6651 3 жыл бұрын

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 3 жыл бұрын

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

@awesomecraftstudio 3 жыл бұрын

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

@curmudgeon7217 3 жыл бұрын

How did carnivores evolve before herbivores?

@danielpaz7696 3 жыл бұрын

wait this isn't eons?

@stax6092 3 жыл бұрын

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?

@hunterG60k 3 жыл бұрын

Thanks for reminding me that eyelash mites exist 😒

@1.4142 3 жыл бұрын

Do lamprey help eliminate invasive asian carp?

@shep4184 3 жыл бұрын

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

@Tooupi 3 жыл бұрын

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

@naathcousins4658 3 жыл бұрын

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

@richardlehoux 3 жыл бұрын

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

@QuitePerplexing 3 жыл бұрын

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

@dorothyjohnson6497 3 жыл бұрын

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

@AutoHunter 3 жыл бұрын

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 3 жыл бұрын

🤮🤮🤮🤮🤮🤮

@DracarmenWinterspring 3 жыл бұрын

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 3 жыл бұрын

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

@pvtpain66k 3 жыл бұрын

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

@bsinita_wokeone 3 жыл бұрын

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. 😞👖

@vnasty2529 3 жыл бұрын

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 3 жыл бұрын

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 3 жыл бұрын

Did you watch the video

@ociorel 3 жыл бұрын

@@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

@1.4142 3 жыл бұрын

Bone marrow is edible

@dustman96 3 жыл бұрын

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

@philipph.4903 3 жыл бұрын

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 3 жыл бұрын

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

@nswanberg 3 жыл бұрын

Teeth are more rock like than bones.

@NamanKumar-vp3ze 3 жыл бұрын

@losfreeborder5377 3 жыл бұрын

The next shall be plastic eaters...

@manoiskee 3 жыл бұрын

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

@rizdalegend 3 жыл бұрын

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

@gregoryfenn1462 3 жыл бұрын

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 3 жыл бұрын

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_ 3 жыл бұрын

'Friendly pets' in YOUR opinion.

@vnasty2529 3 жыл бұрын

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 3 жыл бұрын

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 .