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Tortoises have more rounded and domed shells where turtles have thinner, more water-dynamic shells. ... One major key difference is that tortoises spend most of their time on land and turtles are adapted for life spent in water. Tortoises have club-like forelegs and 'elephantine' hind legs.
Turtle vs. Tortoise. Tortoises and turtles are both reptiles from the order of Testudines, but in different classification families. The major difference between the two is that tortoises dwell on land, while turtles live in the water some or nearly all of the time.