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This article is from the Dolphin FAQ, by Jaap van der Toorn with numerous contributions by others.

2.18 How do dolphins get their water?

Most dolphins live in the ocean and the ocean water is too salty for them to drink. If they would drink sea water, they would actually use more water trying to get rid of the salt than they drank in the first place. Most of their water they get from their food (fish and squid). Also, when they metabolize (burn) their fat, water is released in the process. Their kidneys are also adapted to retaining as much water as possible. Although they live in water, they have live as desert animals, since they have no direct source of drinkable water.

 

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dolphin, mammal, animal, adoption