Whales:
* Baleen whales: Humpback whales, blue whales, gray whales, right whales, etc.
* Toothed whales: Dolphins, porpoises, orcas, sperm whales, etc.
Seals:
* True seals: Harbor seals, gray seals, elephant seals, etc.
* Eared seals: Fur seals, sea lions
Walruses
Polar bears
Sea otters
Manatees
It's important to note that some animals like sea lions and fur seals have a layer of blubber, but they also have a dense fur coat that helps with insulation.