The term 'ocean mammal' can refer to two different animals: the ORCA (also known as the killer WHALE) and the WHALE. The ORCA is a large, toothed WHALE that is easily recognizable by its black and white markings. It is found in all oceans and is highly social, living in pods of up to 40 individuals. The WHALE is the largest mammal on Earth, and is found in all oceans. It is a baleen WHALE, meaning it has a filter-feeding system instead of teeth. Whales are highly intelligent and social animals, and some species migrate long distances each year.