The beluga whale, also known as the white whale, is the only marine mammal of this colour. The beluga is adapted to life in the Arctic, so has anatomical and physiological characteristics such as its all-white colour and the absence of a dorsal fin, which allows them to swim under ice with ease. This whale has a stocky body, and a large percentage of its weight is blubber. Its sense of hearing is highly developed and its echolocation allows it to move about and find breathing holes under sheets of ice.
Belugas are gregarious and form groups of up to 10 animals on averages. They are slow swimmers, but can dive to 2,300 ft below the surface.