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Whales don't live in fresh water because fresh water is too shallow and lacks the large quantities of prey they require to stay alive.

Some dolphins, which are small versions of whales, live in fresh water. Whales have been known to enter rivers, but, rivers do not have enough food to feed whales so they leave fairly soon.

During World War 2 a number of rivers in the United State had anti submarine mines at the river mouth where the rivers empty into the ocean. Occasionally a whale would set one off and get blown up. That is how we know whales swim in rivers.

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13y ago
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6y ago

Most dolphins are salt water but there is a type of dolphin that lives in the Amazon River which is fresh water.

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9y ago

Actually, there are 5 species of dolphins that live in freshwater. They are river dolphins and their species tends to be named after the rived they live in such as the Amazon.

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13y ago

Because they evolved in salt water environments, and as such, are not adapted to freshwater.

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13y ago

First of all whales are salt water mammals. Second of all they also need the nutrients that the salt water provides. It allso deppends on the density of the water and how deep the water is

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14y ago

Some are fresh water dolphins.

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Q: Why whales do not live in fresh water?
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