The pudús are two subspecies of South American deer from the genus Pudu, and are the world’s smallest deer. The two species of pudús are the northern pudú (Pudu mephistophiles) from Colombia, Ecuador, and Peru, and the southern pudú (Pudu puda) from southern Chile and southwestern Argentina. Pudús range in size from 32 to 44 cm tall, and up to 85 cm long. As of 2009, both species are classified as “Endangered" in the IUCN Red List. The pudú is a solitary animal whose behavior in the wild is largely unknown because of its secretive nature. Pudús are crepuscular, most active in the morning, late afternoon, and evening. Each pudú has its own home range, or territory. Pudús do not interact socially, other than to mate. An easily frightened animal, the deer barks when in fear. The pudús are herbivorous, consuming vines, leaves from low trees, shrubs, succulent sprouts, herbs, ferns, blossoms, buds, tree bark, and fallen fruit. They can survive without drinking water for long periods due to the high water content of the succulent foliage in their diets.