Why Are We Warm-Blooded?

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

Warm blooded animals- I'm chilly! shivers Cold blooded animals- I'm chilly goes into a temporary coma

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!

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! Fungi in particular pise a huge problem to reptiles and amphibians, so a theory is that being so warm helped birds and mammals suffer fewer fungal infections.

"Being this hot is hard work" I can relate

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!

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

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?

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

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

10:20 That wasn't just chance. Endothermy was required to stay alive in the global harsh winter that followed this asteroid crash due to teratons of dust thrown up and covering the Sun (and lasted for decades or even centuries). It is quite possible that this particular event forced the animals which were going towards endothermy to go there while forcing most animals that could not reach endothermy fast enough to go extinct.

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.

8:30 The dino was actually saying, “oh crap, this is going to WRECK the economy”

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

My zoology teacher told me that we're warm blooded to become more efficient as in stay working for longer. If we were cold blooded we would have to undergo hibernation to prevent our body temperature from changing (when you're body temperature rises by a few degrees F, it gets so hard for you. Imagine a cold blooded animal. I mean the temperature of the environment can range from -30 to 60 degrees celsius. It would be a nightmare if a creature's body changed so much.). But I think this would be more related to being homeothermic.

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.

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

10:40 I watched a documentary that showed crocodiles were surprisingly good mothers. At least for a short time after hatching.

"...and the tuna can too" Nice bit of word play there ;)

6:57 Collared lizard can run on 2 legs too Sailfin dragon and frilled dragon are also able sprint on 2 legs