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| | MSN Encarta - Turtle |
 | | Scutes are composed of a fibrous protein called keratin, which also makes up the scales of other reptiles. |
 | | American musk and snapping turtles have small, cross-shaped plastrons that enable greater leg movement for walking on the bottom of ponds or streams. |
 | | Some turtles, such as the hawksbill turtle, are killed for their decorative shells, which are the source of tortoiseshell used in jewelry. |
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