Crocodile babies don't have sex chromosomes; the temperature at which the egg develops determines gender.
45
Most elephants weigh less than a blue whale's tongue.
442
There are more insects in one square mile of rural land than there are human beings in the world.
55
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Hummingbirds can weigh less than a penny!
12
Turkeys can reproduce without having sex.
121
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Bluebirds cannot see the color blue.
40