Keeping turtles as pets can be a complicated responsibility. Before you bring that shelled cutie home, do your homework, or you and the turtle may suffer.

The world's nearly 300 turtle species have a remarkable range of behaviors, from wood turtles that stomp the ground to attract worms, to sea turtles that travel thousands of miles to lay eggs.

NATURE's "The Reptiles: Turtles and Tortoises" takes a close look at ancient creatures marching slowly through the millennia.