Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Cats recognise the voice of their owner, but never evolved to care.
22
15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
1
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
The Basenji dog is the only dog that is not able to bark.
4