Horses and cows sleep standing up but can only dream lying down.

Some marine animals use bioluminescence to produce light.

Fact #208 · Animals

Certain insects can mimic leaves to avoid predators.

Fact #463 · Animals

Penguins can drink salt water because of specialized glands.

Fact #362 · Animals

Some birds use tools to obtain food.

Fact #294 · Animals

A tarantula can survive for weeks without food.

Fact #353 · Animals

Some birds cache food for later consumption.

Fact #461 · Animals

Some birds sing complex songs to mark territory.

Fact #517 · Animals

Certain species of frogs are active at night.

Fact #519 · Animals