Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Sloths take two weeks to digest their food.
243
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
There's a competition in Sweden called Kaninhoppning, or rabbit show jumping.
-12
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
A lion in the wild usually makes no more than twenty kills a year.
186