Dolphins have names for one another.
18
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
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
Sloths take two weeks to digest their food.
243
Cats recognise the voice of their owner, but never evolved to care.
22
Denmark has twice as many pigs as there are people.
66
The octopus does not have a blind spot.
273