The reindeer is the only mammal that can see UV light.
17
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Only 3% of bird species have penises.
0
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10
There's a rare breed of pig that looks like a sheep.
14
When cats are happy, they may squeeze their eyes shut.
10
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255