Author: admin, 18.07.2014Dolphins have longer noses, bigger mouths, more curved dorsal fins, and longer, leaner bodies than porpoises.The Northeastern Offshore Spotted Dolphin, shown here, has a falcate, or sickle-shaped dorsal fin and light spotting on the belly. Dolphins and porpoises have many similarities, one of which is their extreme intelligence. It is likely that more (or fewer) differences between dolphins and porpoises will be revealed as researchers continue to investigate these intriguing sentinels of the sea. A study from a team of international scientists has found that a common chemical in many sunscreen lotions and cosmetics is highly toxic to juvenile corals and other marine life.
The orca, or killer whale, for example, is actually the largest member of the dolphin family.
Most scientists agree that there are 32 dolphin species (plus five closely related species of river dolphin) and only six porpoise species. Dolphins make whistling sounds through their blowholes to communicate with one another underwater. Both have large, complex brains and a structure in their foreheads, called the melon, with which they generate sonar (sound waves) to navigate their underwater world.
Scientists are pretty sure that porpoises do not do this, and some think this may be due to structural differences in the porpoise’s blowhole.
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