Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
The oldest recorded elephant lived for 82 years.
213
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217