Aztec medicine included herbal remedies, surgeries, and knowledge of anesthesia using plants like datura.

A koala sleeps for many hours each day.

Fact #490 · Animals

A spider spins silk that is incredibly strong for its weight.

Fact #528 · Animals

Certain birds of prey can spot small animals from great heights.

Fact #483 · Animals

Certain birds of prey have exceptionally sharp vision.

Fact #434 · Animals

The ozone layer is located in the stratosphere.

Fact #140 · Animals

Some fish can change color to blend with their surroundings.

Fact #392 · Animals

Certain fish clean parasites off larger fish.

Fact #523 · Animals

A red kangaroo is the largest marsupial.

Fact #480 · Animals