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
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Cats recognise the voice of their owner, but never evolved to care.
22
Sharks have been on the planet longer than trees.
14
Cows can sleep standing up, but they can only dream lying down.
745
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
A scorpion can hold its breath for up to 6 days.
19