| By the late Oligocene, the two modern lineages of cetaceans had evolved from archaeocete ancestors. |
| Pinnipeds and cetaceans make long-distance seasonal migrations to rookeries or warm-water birthing grounds. |
| These dolphins and other cetaceans don't like divers' bubbles, which is why we had to leave our aqualungs on the boat and snorkel. |
| The environmental group claims the deaths off the British coastline are among a worldwide toll of 300,000 cetaceans worldwide every year. |
| More and more, researchers are finding out just how important sound is to cetaceans like dolphins, porpoises and whales. |
| Porpoising is a behavioral strategy used by small cetaceans and pinnipeds moving at high speed near the water surface. |
