The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called:
Blubber
The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps to protect against the cold and also aid in buoyancy is called blubber. Blubber is found just below the skin and is widely used in the Arctic region as a source of fat. Blubber is also used to make oils.