In addition to providing insulation, blubber actually manipulates a mammal's blood vessels to help it stay warm. Blubber is more densely packed with blood vessels than a typical layer of fat, and when the temperature drops, the blubber constricts those blood vessels to reduce the blood flow in the animal.

What animals have blubber to keep them warm?

Blubber covers the entire body of animals such as seals, whales, 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.

How does blubber keep whales warm?

In order to reduce heat loss, whales have three main adaptations: reducing the body's surface area to volume ratio, using their thick blubber layer as an insulator, and retaining heat through counter-current heat exchange. ...