Horses can sleep standing up because of their 'stay apparatus' — a system of tendons that locks their legs.

Elephants have one of the longest gestation periods of any land animal.

Fact #386 · Animals

Some species of jellyfish glow in the dark.

Fact #357 · Animals

Some sharks detect electrical signals from other animals.

Fact #128 · Animals

The first dinosaurs appeared during the Triassic period.

Fact #632 · Animals

The ozone layer is located in the stratosphere.

Fact #140 · Animals

Certain frogs use loud calls to attract mates.

Fact #459 · Animals

Some birds sing complex songs to mark territory.

Fact #517 · Animals

Certain owls hunt silently because of specialized feather structures.

Fact #542 · Animals