Sea otter raft

Southern sea otters often rest in groups called rafts. Unlike other marine mammals, sea otters do not have a blubber layer to keep warm. Instead, they rely on their fur and burning calories, which means they eat about a quarter of their body weight each day to keep that calorie count up. If people get too close while a sea otter is catching a much-needed nap, the otter will dive or swim away, burning up those much-needed calories to stay warm and forage.