The Bicho Preguiça (Sloth) comprise six species of medium-sized mammals belonging to the families Megalonychidae and Bradypodidae, part of the order Pilosa. They are arboreal residents of the rainforests. Bicho Preguiça are omnivores. They may eat insects, small reptiles, and birds, but their diet consists mostly of buds, tender shoots, and leaves, mainly of Embaúba trees. They have made extraordinary adaptations to an arboreal browsing lifestyle. Leaves, their main food source, provide very little energy or nutrition and do not digest easily. Bicho Preguiça therefore have very large, specialized, slow-acting stomachs with multiple compartments in which symbiotic bacteria break down the tough leaves. As much as two-thirds of a well-fed sloth’s body-weight consists of the contents of its stomach, and the digestive process can take a month or more to complete. Even so, leaves provide little energy, and sloths deal with this by a range of economy measures: they have very low metabolic rates, and maintain low body temperatures when active, and still lower temperatures when resting.