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Below is a free essay on "Dolphins" from Anti Essays, your source for free research papers, essays, and term paper examples.
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Dolphins are aquatic mammals that are closely related to whales and porpoises. Dolphins evolved about ten million years ago.
..   Dolphins belong to the family Delphinidae. It is the largest and most diverse family ofaquatic mammals and includes 26 living species
dolphins vary in size from 2m -3 metres and 150- 300 kilograms. Most species of dolphins are larger than porpoises, with the males usually being larger than the females..

Several species of dolphins are found in most oceans and some rivers . Dolphins live in harbours, bays, lagoons, gulfs and tributaries. They do migrate if the water gets too cold.Also they may migrate if the fish supply and feeding habits change. Some like cold and deeper water than others.

dolphins have a similar streamlined, torpedo-shaped body - their bodies are larger at the front than at the back. The dolphin has a short, stiff neck. The forelimbs have developed into paddle-shaped flippers, which helps in steering through water. The tail of a dolphin (called thefluke) is used for propulsion: it is therefore very muscular. Their teeth are conical in shape.

. Dolphins are considered to be one of the most intelligent of animals and their friendly appearance and playful attitude have made them popular with humans. They love each other’s company. They jump and splash about in large groups called schools. They are great show-offs and do all kinds ofsomersaults, backflips and acrobatics. They have there own language to communicate with each other, which we still don’t fully.They use whistles, squeaks, moans, trills and clicks

Many dolphins are getting killed by being caught in fishermen’s nets. Conserving dolphins is very important to maintain the balance of sea life. We can save dolphins by making seas and rivers safer for them to survive.-------------------------------------------------
Dolphins are playful and cleverness make them fascinating to watch . Dolphins are not fish they are mammals that live in the sea . They have to come to the top of the water every half minute , so they can breathe . But dolphins can stay under the water for six or seven minutes ,if he holds his breath . The dolphin breathes in his head because hehas a blow hole in his head that allows him to breathe . Dolphins have a lot of teeth to help them eat. Each dolphin has almost one hundred teeth in his mouth all the same size and shape . The only work the teeths have is catching food , but not chewing it. First the dolphin catches a fish then he swallows it . A dolphin has a good eye . But sometimes he can't see very well in the water because isso full of shadows , and mud , and plantsthat grow at he bottom . The dolphin uses his ears so much it is hard to see his hears . They are located in the sides of his heads and are two tiny pin holes . The dolphin can hear very well . A dolphin sleeps a foot or two below the top of the water . He takes little naps every half minute or so he moves his tail up and down .This brings him up for abreath of air . Then he drifts down and sleeps some more . Some dolphins stay together they play and learn and grow up . One reason they stay together is the enemies in the sea . The Shark is their enemy and so is the Killer Whale .If a killer whale comes close , the dolphins make a circle . The female dolphins and their babies are in the middle of the circle . The male dolphins swim around the outsideof the cicle . It is hard to attack when there is a bunch of dolphins . But sometimes the enemy attacks and the dolphins attack back . When a dolphin cries for help the other dolphin comes to help . One day some dolphins were playing around a big boat they did flips in the water and jumped high in the air . But one dolphin was jumping too high and was to close to a boat . That fell against the...