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
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
A puppy is born blind, deaf, and toothless.
16
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
The reindeer is the only mammal that can see UV light.
17