Changes in the circulatory and respiratory systems have supplied marine mammals with sufficient levels of oxygen to withstand long dives. The livers and kidneys of marine mammals are super-filters that remove excess salts from the blood and prevent dehydration. Fresh water is obtained from the fish eaten. Nursing mothers conserve their own body fluids by producing a thick milk, rich in fats. The babies metabolize the fat to gain the nutrients they need.
Marine mammals have excellent underwater vision for finding prey.
Toothed cetaceans also have a sonartype system called echolocation. Teeth, baleen, cooperative hunting and feeding, and tool-using are only a few of the structural and behavioral adaptations that have allowed various marine mammals to successfully exploit the food resources of the sea. It is also the animal that gave Point Lobos its name. Point Lobos is the home of hundreds of sea lions from August to June. During the summer months the sexually active males go south to the Channel Islands.