Like humans, dolphins cannot drink salt water.

 

As the majority of dolphin species live in the ocean, they must get their water from their food, such as fish and squid.

 

As with camels in the desert, dolphins must hold on to what water they get.

 

Unlike humans, dolphins do not sweat to keep cool and this helps them retain the water that they have in their body.

 

To cool down, dolphins use a sort of biological radiator which pumps heat to their blubber and skin, especially their flippers, dorsal fin and tail flukes.

 

Source: Dolphinear, Dudzinski