Rattlesnake mating sessions have been known to last more than 22 hours.
232
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The elephant brain weighs about 6,000g.
274
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
Cats and dogs can hear ultrasound.
350
Giant Anteaters' front legs look like a panda.
48
Female kangaroos have three vaginas.
2