Cats recognise the voice of their owner, but never evolved to care.
22
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
The cat brain weighs about 30g.
167
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The octopus does not have a blind spot.
273
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2