Unlike dolphins and whales, most mammals would not be able to live in the ocean. They’d be surrounded by salt water — and unable to drink any of it. This, however, isn’t a problem for dolphins and whales. They have evolved over millions of years and have adapted well to their salty surroundings. Because they have no way of getting drinkable freshwater, they have to obtain it through other sources. Fortunately, whales and dolphins can get the water they need from the food they eat. They can also produce water internally when they break down their blubber reserves. Of course, whales and dolphins can’t avoid taking in some salt water, but they are well equipped to deal with this. The individual cells in their bodies keep the level of salt in their systems balanced. The excess salt is then concentrated and released in their urine.