Colugos are tree-dwelling, gliding mammals found in Southeast Asia. Colugos are shy, nocturnal, solitary organisms found in the tropical rainforests of Southeast Asia. They are also known as cobegos or flying lemurs, although they are not true lemurs. They reach lengths of 35 to 40 cm (14 to 16 in) and weigh 1 to 2 kg (2.2 to 4.4 lb). They are herbivorous and eat leaves, shoots, flowers, sap, and fruit. Although they are placental mammals, colugos raise their young in a similar fashion to marsupials. The young do not reach maturity until they are two or three years old. They have long, slender front and rear limbs, a medium-length tail, and a relatively light build. The head is small, with large, front-focused eyes for excellent binocular vision, and small, rounded ears.

They are the most capable and proficient gliders of all gliding mammals, using flaps of extra skin between their legs to glide from higher to lower locations. They can travel as far as 70 m (230 ft) from one tree to another without losing much altitude. They have a large membrane of skin, or patagium, which extends between their paired limbs that runs from the shoulder blades to the fore paw, from the tip of the rear-most finger to the tip of the toes, and from the hind legs to the tip of the tail. The spaces between the colugo's fingers and toes are webbed. As a result, colugos were once considered to be close relatives of bats but today are considered the closest living relatives of primates.

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