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DescriptionThe grey-legged night monkey belongs to the nocturnal primate genus Aotus, which is also one of the most widespread primate genera in the neotropics. This species is a relatively small monkey, and there are no differences in appearance between males and females. This monkey has a slightly astonished look due to its large eyes, but unlike many nocturnal species, the eyes do not shine in torch light. This is because they do not have a 'tapetum lucidum' – the reflective layer behind the retina of night-time animals that enhances the amount of light they can receive. The lack of this layer betrays the grey-legged night monkey's relatively recent evolutionary split from diurnal monkeys. The coat is thick and two-tone; the tips of the fur are greyish-brown with much lighter bases on the back (3), and pale yellow or orange on the underside (4). The face has white patches above and below the eyes, the cheeks are grey and there is a thin grey stripe down the centre of the forehead. The thick tail is only a little shorter than the body and acts to balance the monkey when walking on all fours along branches. The fingers have true nails and obvious pads to aid grip (3).