Why do sea otters need to eat so much food each day?

Sea otters must consume approximately 25 percent of their body weight in food daily to sustain an exceptionally high metabolic rate, which is about three times higher than that of comparable land mammals.1

Unlike other marine mammals that rely on thick layers of blubber for insulation, sea otters depend on their dense fur and internal heat production to survive in near-freezing waters. To maintain homeostasis in such a cold environment, they generate significant internal warmth through a process called "thermogenic leak," where mitochondria in their muscle cells release heat rather than producing energy for movement. This constant, high-level heat production requires a massive intake of calories to maintain their energy balance. Consequently, sea otters spend nearly half of their time foraging and eating to meet these intense physiological demands.1