Beluga

Beluga Whales are found in the Arctic seas and are highly sociable mammals. They can be found from a few in their groups up to hundreds individuals. When winter comes around, these white whales are migrating south, returning when the sea thaws up. To withstand the freezing temperatures of the arctic waters, Belugas have tough dorsal ridges and thick blubber to insulate the cold. Another characteristic is that the vertebrae in the neck of Belugas is not fused, hence giving them the ability to turn their head in all directions, while also being capable of changing the shape of their foreheads, giving them a range of facial expressions. They have been spotted swimming backwards. In the wild, polar bears and killer whales are natural enemies.