55 million years ago, as the Earth heated up, many mammal species got smaller. Could the same thing happen again with human-induced global climate change?
Lizards don't really breathe and walk at the same time. Does this mean that dinosaurs couldn't either?
Sorry BUGS, your brain isn't equipped for REM sleep, or any sleep for that matter.
As a cat owner and cat lover I can't help but be a little defensive. And I wonder: don't other pets kills wild animals, too?
Marine mammals don't sleep for a solid 8 hours a night, the way we do.
The main difference between hair and fur is where it grows, not what it's made of.
Rats have a strikingly different visual system than our own, one that is carefully attuned to their unique needs.
We can all hum the song from the "Jungle Book", but what really are the bare necessities for a big bear?
Scientists tested eighteen reindeer with light, and found that their eyes responded to both visible light and ultraviolet.
Scientists found that nearly identical genes play key roles in the formation of the eyes in mammals and fruit flies.