Southern Sea Otters wear the world's densest fur- more than a million hairs per square inch.
California Sea Lion. Of the five species of sea lions worldwide, this is the only one whose population is on the rebound due to conservation efforts.
California Sea Lions often rest quietly on the surface of the water in "rafts" of several animals, heads and flippers poking above the water. By waving a flipper in the air, they absorb heat from the sun and avoid losing heat to the water.