Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae. The family includes tree squirrels, ground squirrels, chipmunks, marmots (including woodchucks), flying squirrels, and prairie dogs. Squirrels are indigenous to the Americas, Eurasia, and Africa and have been introduced to Australia. Squirrels are first attested in the Eocene, about 40 million years ago, and are most closely related to the mountain beaver and to the dormice among living species.
The word squirrel, first attested in 1327, comes via Anglo-Norman esquirel from the Old French escurel, the reflex of a Latin word sciurus. This Latin word was itself borrowed from Ancient Greek word σκίουρος, skiouros, which means shadow-tailed, referring to the bushy appendage possessed by many of its members.
The native Old English word, ācweorna, survived only into Middle English (as aquerne) before being replaced.[3] The Old English word is of Common Germanic origin, with cognates such as German Eichhorn, Norwegian ekorn, Dutch eekhoorn, Swedish ekorre and Danish egern.
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