Two animals commonly called "fat" due to their large fat reserves or thick layers of blubber are the walrus and the elephant seal. The walrus has a substantial layer of insulating fat called blubber, which makes up around a fifth of its weight and helps it survive in harsh Arctic conditions. The elephant seal is known for having up to 40% of its body weight as blubber, which aids in long underwater dives and energy storage during breeding seasons. Both animals rely heavily on their fat for insulation, buoyancy, and energy reserves.