Why Are We Warm-Blooded?

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A human with the metabolism of a hummingbird would need to eat about 80,000 calories a day to survive. That’s because staying warm by making your own heat takes a ton of energy. And that brings up a paradox, because creating your own body heat is incredibly expensive. The largest animals on Earth have to spend most of their day just eating enough to keep their heat engines running. So why aren’t we cold-blooded… like crocodiles? Here’s the science
References: sites.google.com/view/warm-bl...
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Пікірлер: 2 100

  • @Jjjj-ue6wq
    @Jjjj-ue6wq3 жыл бұрын

    "Being this hot is hard work" I can relate

  • @premnaren8675
    @premnaren86753 жыл бұрын

    Warm blooded animals- I'm chilly!

  • @davidalfonsoportillomiramo6124
    @davidalfonsoportillomiramo61243 жыл бұрын

    I just wanted to point out that there's actually around 50 species of lizards that can run on two legs (frilled lizard and bearded dragons to name some popular ones,) this seems to happen because once the lizard reaches top speed, the laws of physics force them into an upright position so they can run faster. Maybe it was worth mentioning though that most lizards can't run and breathe at the same time. Love this channel, keep up the good work!

  • @OverlordMaggie
    @OverlordMaggie Жыл бұрын

    I'm glad it was addressed in the subtitles - for those who don't use them, being so warm can also impede infections, hence how we fever when we're sick or go hot locally when we have an infected wound!

  • @commentor3485
    @commentor34853 жыл бұрын

    There is probably a dad in the body that controls the internal temperature and he has to stop people from touching the thermostat.

  • @klazienanalenveehouderkweker
    @klazienanalenveehouderkweker3 жыл бұрын

    I like how the globe being sassy has become a running gag

  • @ylhajee
    @ylhajee3 жыл бұрын

    I've heard (I think on Scishow) that body temperature is correlated to how susceptible to fungal infections animals are. So one more advantage of warm-bloodedness may be that you get fewer fungal infections. Do you know how accurate this is?

  • @Najakeeper
    @Najakeeper3 жыл бұрын

    Crocs are great parents. They wait by their nests without feeding for months and some dig and carry their babies to water in their mouths. Babies also call for their parents when in trouble. Better parents than some people I know for sure.

  • @erikziak1249
    @erikziak12493 жыл бұрын

    I guess Shrewdinger is both cold blooded and warm blooded when you do not look at it.

  • @jaysabol1821
    @jaysabol18213 жыл бұрын

    Just real quick, I wanna say thank you to this channel and others PBS supports for allowing me to go down rabbit holes like these. The way you encourage education is phenomenal, and i'm glad that one day my kids will have a this channel to watch with me

  • @mandisaplaylist
    @mandisaplaylist2 жыл бұрын

    10:20

  • @minutemansam1214
    @minutemansam12143 жыл бұрын

    I'm surprised he didn't bring up pregnancy possibly being the stepping stone for warm bloodedness. Many reptiles and fish become partly endothermic while they are pregnant, so warm bloodedness could potentially be a trait that is beneficial for organisms that do internal fertilization, instead of external fertilization.

  • @corwin32
    @corwin323 жыл бұрын

    8:30

  • @domc3040
    @domc30403 жыл бұрын

    So if the shrewdinger is the ancestor of all placental mammals, does that mean that technically all cats are... shrewdinger's cat? :D

  • @Mahi16389
    @Mahi16389 Жыл бұрын

    In defense of the crocodile's they do win coolest parent of the years award 🐊

  • @miraculousmarrtian8753
    @miraculousmarrtian8753 Жыл бұрын

    The Egg in the frying pan was a classic. Best way to educate about drugs. Just say they all melt your brain.

  • @vir822
    @vir8223 жыл бұрын

    Fyi crocodile might win the parenting award coz ..a documentary from Attenborough described how gentle they can be while handling babies just hatched ..also they run full day care for other Crocs ...and take care of them

  • @andrewvirtue5048
    @andrewvirtue50483 жыл бұрын

    I feel like this somehow explains why that when I was a kid, I would go outside and just lay in the parking lot in front of my apartment. I enjoyed the heat that radiated from the road. Or go sit in my moms car as it cooked in the summer sun. Because I was really under fed, and was always hungry!! This makes sooo much sense!

  • @hanifanzak
    @hanifanzak2 жыл бұрын

    6:57

  • @perialis2970
    @perialis29703 жыл бұрын

    warm blooded animals: man its winter :/