TIL a cave goat that went extinct approx. 5,000 years ago is the first known mammal to have become cold-blooded. Their bone growth rate is unlike any other mammal, and more similar to crocodiles in showing slow and adaptive rates to environmental temperature.
The goat’s binomial name is Myotragus balearicus. It was kind of an oddball in a lot of other ways, too, an example being that it had forward-facing eyes, giving it stereoscopic vision, which was pretty odd for an ungulate.
