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.
For more information about the topic Whale, read the full article at Wikipedia.org, or see the following related articles:
Recommend this page on Facebook, Twitter,
and Google +1:
Other bookmarking and sharing tools: