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Whale

Whales are the largest species of exclusively aquatic mammals, members of the order Cetacea.

Like all mammals, whales breathe air into lungs, are warm-blooded, feed their young milk from mammary glands, and have some (although very little) hair.

Whales are broadly classed as predators, but their food ranges from microscopic plankton to very large fish.

Some whale species have a sophisticated social system.

Most species of large whales are endangered as a result of large-scale whaling.

Note:   The above text is excerpted from the Wikipedia article "Whale", which has been released under the GNU Free Documentation License.
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July 30, 2015

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