> ## Content Index
> Fetch the complete content index at: https://www.cascadepbs.org/llms.txt
> Use this file to discover other available public pages before exploring further.

# Why Are We Warm-Blooded?
- URL: https://www.cascadepbs.org/show/its-okay-be-smart/episode/why-are-we-warm-blooded-g1m5s4/
- Published: 2024-04-02T23:16:50.000Z
- Updated: 2025-08-20T09:55:41.000Z
- Description: Here's the science behind why humans are warm-blooded.
- Author: Cascade PBS Staff
- Tags: Be Smart, Season 9, Episode 6, #ZZZ_Episode_db121c29-d2df-4a2a-844e-f95f7fd0f313, #episode, #ZZZ_Show_dc38a6e9-266e-43c1-b647-45e7445fad27, #v1.16

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.