The three-toed sloth is one of the many animals that live in the rainforest. These sloths are quite interesting. They have extremely low metabolic rates, meaning that they have burn off energy very slowly. They do not have many energy needs either. They only need to eat 56 calories a day in order to survive! Three-toed sloths are the lowest documented energy-needing animals. They spend most of their time eating and sleeping.