The reindeer is the only mammal that can see UV light.
17
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Tigers can see 6 times better at night than humans.
305
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109