The seahorse is the only fish to have a neck.
12
Cats recognise the voice of their owner, but never evolved to care.
22
Cats sleep for 70% of their lives.
8
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Sharks, like other fish, have their reproductive organs in their chests.
248