Science Main Index
Turtles are a reptile found in most parts of the world. Some turtles live on land, while others live in the sea. They are easily recognized by their shell. The turtle's shell is covered with scales made keratin, the same material as human fingernails. Many turtles can retract their head and limbs into their shell for protection. The largest turtle, the leatherback sea turtle, can have a shell length of 80 inches and weigh up to 2,000 lbs. A small turtle may be only 3 inches long and weigh 5 oz. Turtles have a beak, not teeth. Female turtles lay eggs to reproduce their young. Play the following videos to learn more about the turtle.