Did you know that, there are almost 40 different kinds of dolphins swimming in our planet's water? Of course, most of those species live in the salt waters of seas and oceans. The majority can be found in the areas of the tropics, in the warm, shallow parts of the oceans. However, there are actually 4 dolphin species that live in the rivers, and actually like to help the fisherman, by chasing the flocks of fish into the nets.
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