Tree squirrels are found throughout the world. They are present on all continents with the exception of Australia and Antarctica. A gray squirrel (Sciurus carolinensis) population introduced to Australia went extinct in the 1970s. They are ab-

Douglas's squirrel (Tamiasciurus douglasii) feeds at an aspen sapwell in Eastern Sierras, California. (Photo by Richard R. Hansen/Photo Researchers, Inc. Reproduced by permission.)

A squirrel caches food items to consume later. (Illustration by Jarrod Erdody)

sent from the polar regions, Madagascar, parts of southern South America, north Africa, and Australasia.

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