Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Ducks will only lay eggs early in the morning.
36
The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
328
Elephants are the only animals that can't jump.
1
In the last 4,000 years, no new animals have been domesticated.
25
The flea can jump 350 times its body length, that is like a human jumping the length of a football field.
32
A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.
52