Photo of a walrus in the Arctic.

Word of the Week: blubber

blubber (BLUH-buhr) noun. thick layer of fat under the skin of marine mammals.

Photo of a walrus in the Arctic.
This Atlantic walrus is able to survive in the Arctic because of its blubber. Blubber is not the same thing as fat found on other animals. See more photos of blubber. Photo by Mary Ford


Blubber covers the entire body of animals such as seals, whales, manatees, and walruses—except for their fins, flippers, and flukes. Blubber an important part of a marine mammal’s anatomy. It stores energy, insulates heat, and increases buoyancy.

Blubber is different than most types of fat. Blubber is much thicker and contains many more blood vessels than the fat found in land animals, including humans. Blubber is so unique that many marine biologists don’t refer to blubber as fat at all. To them, blubber is a unique type of connective tissue between the animal’s skin and its internal organs.

Do this experiment—in your classroom or at home—to create a blubber mitten and feel the effects of blubber first-hand.

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