Arctic beluga whales are one of the most popular members of Marineland's marine mammal family. One of the most abundant mammals in Canadian waters, belugas are well known for their striking appearance. As a beluga whale ages, its skin loses pigment cells which causes it to turn a unique shade of white. Belugas are also very playful, friendly mammals. They can nod and turn their heads because, unlike most whales, their seven neck vertebrae are not fused.