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Cetacea - Adaptations for Sea Life

Cetacea - Adaptations for Sea Life: Encyclopedia II - Cetacea - Adaptations for Sea Life

Over a period of millions of years, the cetacean returned to the sea - there was more food there, and more space than on land. Because of this increase in space, there was no natural limit to the cetacean's size (i.e. the amount of weight its legs could hold) since the water provided buoyancy. It had no longer any need for legs. During this time, the cetacean lost the qualities that fitted it for land existence and gained new qualities for life at sea. Its hind limbs disappeared, its body became more tapered and streamlined - a form t ...

Cetacea: Encyclopedia II - Cetacea - Adaptations for Sea Life

Cetacea - Adaptations for Sea Life

During this time, the cetacean lost the qualities that fitted it for land existence and gained new qualities for life at sea. Its hind limbs disappeared, its body became more tapered and streamlined - a form that enabled it to move swiftly through the water. For the same reason, most of its fur disappeared, reducing the resistance of the giant body to the water. The cetacean's original tail was replaced by a pair of flukes that acted like a propeller.

As part of this streamlining process, the bones in the cetacean's front limbs fused together. In time, what had been the forelegs became a solid mass of bone, blubber and tissue, making very effective flippers that balance the cetacean's tremendous bulk.

After the cetacean's hair disappeared, it needed some way of preserving body heat. This came in the form of blubber, a thick layer of fat between the skin and the flesh that also acts as an emergency source of energy. In some cetaceans the layer of blubber can be more than a foot thick.

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Adapted from the Wikipedia article "Adaptations for Sea Life", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki

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