 Slow lorises ( genus Nycticebus ) are primates that belong to the suborder Strepsirrhini . They are found throughout South and Southeast Asia and the surrounding islands , and live in the upper canopy of tropical rainforests . They are nocturnal , sleeping during the day curled up in the fork of a tree . Slow lorises are slow and deliberate climbers and rarely come to the ground . They have a round face , woolly fur , a dark stripe down their back , and a tail that is reduced to a stump . Their head and body length ranges from 18 to 38 cm ( 7 @.@ 1 to 15 @.@ 0 in ) . Their hands and feet are strong and good at grasping for long periods of time . Slow lorises are either solitary or live in pairs ; the males are territorial and mark their territories with urine . Their diet consists of mollusks , small vertebrates , and fruit . 
