Three-toed Sloth (Bradypus tridactylus), here photographed at the Parque Nacional Manuel Antonio, a small National Park located on the Pacific Coast of Costa Rica. The three-toed sloth is a solitary nocturnal and arboreal animal, found in mature and secondary rainforests and deciduous forests, and it mainly lives in Cecropia trees. These mammals belong to the Bradypodidae family, part of the order Pilosa. Sloths 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: sloths have very large, specialized, slow-acting stomachs with multiple compartments in which symbiotic bacteria break down the tough leaves.