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Crocodiles protect their nest, eggs, and young for up to three years.

The only animals born with horns are giraffes.

Salmon go through growth states of fry, pan, smelt, and grilse.

Bats are the only mammals that can fly.

An Artic char is a type of trout.

Sweetbread is the thymus gland of an animal.

The only milk that doesn't curdle when boiled is camel milk.

Laika was the name of the first living creature to be sent into orbit. Laika was a dog and was sent on Sputnik 2 by the Soviet Union.

The ostrich is the only bird that provides us with leather.

A snake is smelling when it sticks out its tongue.

The pig is the nearest living relative to the hippopotamus.

The chicken is the closest living relative of Tyrannosaurus Rex.

The elephant is the only mammal that can't jump.

The biggest crocodiles in the world are in Australia, where some are more than 20 feet long.

Sharks attack men ten times more often than they attack women.

The shark is the only known animal that never gets sick.

The average hen lays 260 eggs in a year.

A cow gives approximately 200,000 glasses of milk during her life.

Crocodiles can't stock out their tongues because it is a protection to prevent them from biting off their tongue with all of those sharp teeth and very powerful jaws.

Dogs are the only animals with a prostate.

Armadillos are the only animals that can get leprosy.

The animal with the most taste buds is the catfish, with more than 27,000.

The only insect that can turn its head is the praying mantis.

The penguin is the only bird that can swim but can't fly.

A kangaroo can't jump unless its tail is touching the ground.

The average body temperature of birds is 108 degrees Fahrenheit.

The first zoo in the United States was in Philadelphia, Pennsylvania, in 1876.

The only bird that hunts by the sense of smell is the kiwi.

The only animal with four knees is the elephant.

The only place on the body of a cow that has sweat glands is the nose.

The African Elephant is the largest land animal in the world.

The only two mammals that lay eggs are the echidna and the platypus.

The giraffe is the tallest living mammal.

The wingspan of a bald eagle is 6 to 8 feet.

A caterpillar has 6 true legs and 10 prolegs.