Dolphins

Like other whales, dolphins are mammals. They are warm-blooded, have four-chambered hearts, and breathe air.
Dolphins are found in all seas from polar regions to the tropics, and some species inhabit fresh-water rivers. Some species travel alone, and some travel in schools. Because of it's large and powerful tail, the dolphin is a good swimmer and diver. Females give birth to a single calf. The calf is fed on milk produced by the females mammary glands. The adult dolphin usually feeds on fish, squid, and other aquatic animals.
Dolphins appear to have a high decree of intelligence.
Some dolphins do not have a beak, and the largest beak-less dolphin is the killer whale.
Killer whales are probably the fiercest animals of the sea.
They are intelligent, having a language of whistles, chirps, clicks, and moans which they use to "talk" to one another and communicate with people.
The Indus and Ganges river dolphins are almost blind.
They live most of the time in muddy estuaries where it is impossible to see things more than several centimeters away. Eyesight is not important to these whales. They find their way around and capture food using echolocation. River dolphins feed on fish and shellfish such as shrimps and lobsters. The Ganges river dolphin is the largest species of river dolphins, growing up to 2.6 meters from tip to tail and weighing up to 90 kilograms. It also has the greatest life span.
The Amazon river dolphin has been known to swim upside-down, peering at the river bed in search of crabs and shrimps. The bristles on the top of the snout are very sensitive to touch and may be used to find food on the muddy bottom.
There are five species of river dolphin. Each one is limited to a specific great river system of Asia or South America, from which they get their common name. In India river dolphins are named susa, and in South America boutu.

Family: Delphinidae.
Family of River dolphin: Platanistidae.   

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