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Dolphins are very intelligent  animals and they are begins to humans. This water mammals are able to facinate us in many different ways. These mammals live in a group. They have been know to help humans in a variety of circumstances including rescue and fishing.
There are 36 species of dolphins that have been found. 32 species are dolphins the sea is already well know by the people and 4 species are river dolphins. It's very interesting to see and learn about the dolphin species.
Dolphins can be very entertaining. They can jump out of the water. Some of them can jump up to 30 feet in the air. The dolphins are grayish blue and his skin is very sensitive to human touch  and other objects.
ALthough the dolphins have 100 teeth, they don't use heir teeth to eat. They use it to get fish then they awllow the fist. They can consume fish up to 15 kg/day. They always gather in agroup to hunt fish.