Mud

The Eastern Mud Turtle (Kinosternon subrubrum) is a small semi-aquatic, generally freshwater turtle. Turtles are members of the phylum Chordata and the class Reptilia. The eastern mud turtle lives in the southeastern parts of the United States. This species of turtles generally live both on land, underground during the cold months, and reside in water for the remainder of the year. These turtle generally mate underwater, but lay their eggs on land.

http://en.wikipedia.org/wiki/Mud_turtle