There are no cold-blooded mammal species left alive in the world, and apparently that's our fault. In essence, you can split every animal in the world down to either an endotherm or an ectotherm. Warm-blooded creatures such as mammals and birds are endotherms, which mean we're able to maintain our own body temperature without an external heat source. Of … [Read more...] about Humans likely responsible for extinction of world’s only cold-blooded mammal