Dolphins sleep at night just below the surface of the water. They frequently rise to the surface for air.

An albatross can sleep while it flies. It apparently dozes while cruising at 25mph.

Amazon ants (red ants found in the western US) steal the larvae of other ants to keep as slaves. The slave ants build homes for and feed the Amazon ants, who cannot do anything but fight. They depend completely on their slaves for survival.

A chameleon can move its eyes in two directions at the same time.

The humming bird is the only bird that can hover and fly straight up, down, or backward!