Any of some 49 species (family Testudinidae) of slow-moving terrestrial, herbivorous turtles, found in the Old World and New World but chiefly in Africa and Madagascar. Tortoises have a high, domed shell, heavy elephant-like hind legs, and hard-scaled forelegs. The four North American species (genus Gopherus) have a brown shell and flattened forelimbs adapted for burrowing and are about 8–14 in. (20–35 cm) long. The common, or European, tortoise (Testudo graeca) has a shell about 7–10 in. (18–25 cm) long. Most species of giant tortoises (genus Geochelone) on the Galapagos and other islands are now rare or extinct. One captive Galapagos tortoise had a shell 4.25 ft (1.3 m) long and weighed 300 lbs (140 kg).