The cell then swells, possibly even to the point where the cell will burst. These exploded cells are referred to as lysis. Therefore, a cell in a hypertonic solution tends to shrivel up like a grapefruit in the sun. Animals regulate the amount of water in their bodies in very individual ways, each suited for the environment in which they each live. Sharks and fish are able to live in an environment nearly saturated by salt by having a sort a immunity to it.
Some sharks survive by making their blood as toxic as the surrounding water.
Certain seaside animals as well have developed ways to keep the salt in their water from dehydrating them. Some kinds of birds and reptiles have a sort of nasal salt gland which allows them to excrete the large amounts of salt that they take in when they drink. Some mammals as well can live in highly saline environments by making their urine stronger, and having very dry fecal material.