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| Mammals |
| Mammals in the marine environment range from polar bears and sea otters to whales, dolphins, seals, and manatees. |
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| Manatees and the dugong. (sirenians) |
| Elephant seals, harbor seals, sea lions, fur seals, and the walrus. (pinnapeds) |
| Battle scarred male elephant seal resting at Greyhound Rock, just north of Santa Cruz, California. |
| The ANATOMICAL DRAWING below of a manatee reveals several adaptations to life as an aquatic grazer. Lungs lying along the back help to keep the animal horizontal under water. Flippers and a prehensile upper lip are used to manipulate food. |
| New teeth (right) are constantly generated at the rear of each tooth row and move forward. Eventually, teeth worn out by chewing abrasive grasses drop out. The food is digested as it passes through the long hindgut (cecum to anus) for several days. |
| Whales, dolphins, porpoises, and orca. (cetaceans) |
| Warning! the video below is violent. |
| Warning! the video below is violent. |
SM