Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Cows can sleep standing up, but they can only dream lying down.
745
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
Condoms were originally made of animal intestines or linen.
347
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Parrot parents "name" their children with a signature call.
112
Cats and dogs can hear ultrasound.
350