Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Squirrels forget where they hide about half of their nuts.
698
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Penguins have a gland above their eye that turns saltwater into freshwater.
12