A tortoise is an animal with a shell on its back, and it is related to turtles.  A tortoise, though, only lives on land; it cannot live in water.  

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picture of a tortoise
Giant Galapagos Tortoise (Hood Island) - Geochelone nigra hoodensis
A tortoise with a hard, curved shell covering its back, and a long neck stretching up. The tortoise is walking through sand, dragging its belly along the ground.Kolk, Melinda. tortoise41.jpg. June 2007. Pics4Learning. 27 Oct 2010 <>