Be Smart

Why Are We Warm-Blooded?

Season 9 Episode 6 | 11m 18s | Video has closed captioning.

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; creating your own body heat is incredibly expensive. So, why aren’t cold-blooded… like crocodiles? Here’s the science.

Aired: 05/04/21

Rating: NR


Problems Playing Video? | Closed Captioning