Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
A Giraffe has the same number of bones in its neck as a man.
36
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Sheep can survive for up to two weeks buried in snow drifts.
260
On average, it takes 660 days from conception for an elephant to give birth.
19
When cats are happy, they may squeeze their eyes shut.
10