
How do Marine Mammals Hydrate?
Most animals have some level of salinity in their blood. For terrestrial animals, maintaining that salt concentration is fairly straightforward - eat and drink water and your kidneys will do the rest. In aquatic environments, however, there is an added challenge. In a marine environment, the salt concentration of the water surrounding an animal is much higher than that of the animal itself, so drinking salt water actually dehydrates marine mammals (think how dehydrating...