| Did you know that whales are mammals? Many people mistake them for fish because of their habits and life styles, but because they are warm-blooded and give live birth to their young, whales are considered mammals. |
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There are two main types of whales. One, baleen whales, feed on tiny creatures in the water called plankton by filtering them with their teeth. The biggest mammal in the world, the blue whale, is part of that group. |
| The other type, toothed whales, hunt for their prey, which is usually small fish. You are probably familiar with the orca, or killer whale, which is part of that group. |  |
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Dolphins can also be classified as toothed whales. At left, there is a group of dolphins you may not be familiar with - black dolphins. |
