Roosters can't crow if they can't fully extend their necks.
28
A duck's quack doesn't echo, and no one knows why.
173
Ants don't sleep
15
A chameleon's tongue is twice the length of its body.
29
The blesbok, a South African antelope, is almost the same color as grapejuice.
14
A polar bear's skin is black. Its fur is not white, but actually clear.
25
The lifespan of mammals is about 1 and a half billion heartbeats.
127