* Whales: All whales, including baleen whales (like humpback and blue whales) and toothed whales (like dolphins and orcas) have blubber.
* Seals: All seals, including harbor seals, grey seals, and elephant seals, have blubber.
* Walruses: Walruses, which are closely related to seals, also have blubber.
* Polar bears: While polar bears are land mammals, they spend a significant amount of time in the water and rely on blubber for insulation in the Arctic cold.
* Manatees and Dugongs: These large, herbivorous marine mammals, often called "sea cows," also have blubber.
Key functions of blubber:
* Insulation: Blubber helps these animals stay warm in cold water temperatures.
* Buoyancy: Blubber provides a layer of insulation that helps them float.
* Energy reserve: Blubber is a rich source of energy that animals can use when food is scarce.
It's important to note that not all marine animals have blubber. For example, sea otters rely on their thick fur for insulation, rather than blubber.