Penguin, common name for flightless, aquatic birds of the southern hemisphere. The name penguin originally was applied to the now extinct great auk of the North Atlantic, a large flightless, black and white bird with an upright stance. Similar flightless birds were discovered subsequently in the southern hemisphere, and they were also called penguins, a name that is now restricted exclusively to these birds.
II PHYSICAL CHARACTERISTICS
Most penguins have a white breast and a black back and head. Many species exhibit red, orange, or yellow patches on the head and neck. Because their short legs are placed far back on their bodies, penguins assume an upright posture.
Penguins are grouped into 18 species and 6 genera, most of which a
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