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
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
There are some species of snails that are extremely venomous.
72
A rodent's teeth never stop growing.
16
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10