http://en.wikipedia.org/wiki/Mammal
Mammals evolved from four-legged ancestors. They use their limbs to walk, climb, swim, or fly. Some land mammals have toes that produce claws for climbing orhooves for running. Aquatic mammals like whales and dolphins have flippers which evolved from legs.
Mammals evolved from four-legged ancestors. They use their limbs to walk, climb, swim, or fly. Some land mammals have toes that produce claws for climbing orhooves for running. Aquatic mammals like whales and dolphins have flippers which evolved from legs.
Aquatic
Whales and dolphins propel themselves through the water by moving their tail flukes up and down, adjusting the angle of the flukes as needed. The more massive front of the body contributes stability.
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