If they do they don't have to go far to find a drink

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They sweat. That is why the ocean is salty.

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does a bear shite in the woods, is a frogs arse water tight, questions questions.

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Fish that live in saltwater lose moisture from their bodies through a process called osmosis. This is because seawater has a higher salt concentration than the body fluids of fish. Therefore, seawater fish must drink continually or they will become dehydrated. Luckily for such fish they’re perfectly adapted to their surroundings and whereas drinking saltwater would be a bad idea for us, fish are able to excrete the excess salt they drink. In contrast, freshwater has a lower salt concentration than the body fluids of fish. Therefore freshwater fish never need to drink.

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No

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