Sharks have been on the planet longer than trees.
14
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
In Australia, there are spiders big enough to eat snakes.
20
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
Denmark has twice as many pigs as there are people.
66
Cats recognise the voice of their owner, but never evolved to care.
22
Jaguars frequently get high by eating hallucinogenic roots, which also increases their senses for hunting.
6
Dogs sometimes fake being sick to get attention.
26