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Look at those legs!

Mammals walk, run, swim and climb on legs of all shapes and sizes. Some legs evolved shaped for maximum power; others evolved for speedy long-distance running. And certain legs strike a balance between power and speed.

power leg
Legs adapted for power have thick, heavy bones, with ridges where strong muscles are attached. Toe bones are thick and short.

thick, ridged thigh
sturdy shin
short foot
5 toes
fast leg
To cover lots of ground fast, a leg must be long and slender. The fastest runners have long feet, and run on the tips of their toes (and often have just one or two toes, at that).
slender thigh
slender shin
long foot
2 toes

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