The shape of their body helps them to survive. They have short wings that help them swim and to dive up to to catch larger fish. The deepest dive recorded is . They can swim up to for a short time, which lets them escape their main enemy, the leopard seal. They can stay warm because they have a thick layer of blubber. The layer of downy feathers trap air that keeps the body heat in and cold air and water out. They also have large amounts of body oil that help in keeping them dry in the water.