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Common Dolphins

are playful and friendly. And the Common Dolphin is the kind of dolphin seen most.

hunter aaron

on 23 October 2012

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Transcript of Common Dolphins

Common Dolphins By Sydney Johnson The Common Dolphin varies in appearances. The adult Common Dolphin Weighs 155lbs to 245lbs Common dolphins are highly vocal and produce a range of clicks and whistles used for both communication and navigation. They live in large herds, ranging from dozens to more than 1000. The males tend to hang out together in their own groups, and so do females and their calves. The Common Dolphins Scientific name is Delphinus delphis. There are two kinds of Common Dolphins, the Short-beaked Common Dolphin and the Long-beaked Common Dolphin. All dolphins rest half of their brains. Because if whales and dolphins rested their whole brain they would probably drown. The side of the whale or dolphins side of their brain that's not resting controls the whales or dolphins movements. Long beaked common Dolphins and Short Beaked Common Dolphins both live in a marine habitat, but close to coasts. Short-beaked Common dolphin is found along all the coasts in Europe except Scandinavia, along the eastern and western coasts of North America; western coast of South America and in pockets around Japan, New Zealand and Tasmania. Long-beaked Common Dolphin is found around eastern and western coasts of South America; south-western coast of North America; southern Japan, around all the coasts of Madagascar, and in pockets in southern and western Africa and the Arabian Peninsula. Common Dolphins are often found in large, active pods: jumping and splashing can be seen and even heard from a considerable distance. They bunch together when they're scared.

Dolphins, like other animals, have an immune system, that protects them against disease. That does not mean of course that dolphins do not get ill. Dolphins are susceptible to bacterial, viral and fungal diseases. The most common disease is (bacterial) pneumonia. Dolphins also often have skin diseases, like dolphin pox (small black dots or tattoo-like lesions, caused by a virus). Also fungal diseases (like candida infections) are common.

Pollutants, especially DDT and PCBs, have a negative effect on the immune system. If a dolphin carries a lot of these substances, there is an increased risk of disease.

Wild dolphins often have a lot of parasites. Most common is a nematode worm (called Nasitrema) which lives in the nasal sinuses of the dolphin. Almost every wild dolphin has this parasite. Dolphins also can have tape worms and liver flukes (a trematode worm). Usually, the parasites are not life threatening, just irritating. But when a dolphin becomes ill, these parasites may multiply and cause additional problems. Animals that are found stranded on the beach usually have a lot of parasites.

Every now and then, large numbers of dolphins suddenly die because of a natural toxin (poison). When certain algae (dinoflagellates) suddenly bloom, fishes may have a lot of these algae in their stomachs. Usually, these algae are harmless for fishes. But when dolphins eat a lot of these fishes, the toxin is released and the dolphins get poisoned. In the past years, a few of these algal blooms have been blamed for mass mortalities in dolphins, especially along
the Atlantic coast of the United States. The Common Dolphin eats fish, squid, or octopus. I'm going to be a marine biologist when I grow up. I borrowed a book from the library about whales, dolphins, and porpoises. It had all of the information about whales, dolphins, and porpoises. So I went to the oceanic dolphins with prominent beaks. And on the first dolphin of oceanic dolphins with prominent beaks was the Common Dolphin, and so I became interested and decided to do a power point about Common Dolphins. Why Did I Do This Power Point?
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