This nocturnal primate is dull reddish-brown in color with darker fur surrounding the eyes (Ratajszczak, 1998). The dorsal side of the pelage is darker than the ventral side, which is lighter in color (Ankel-Simons, 2000). This species has a faint or absent dorsal stripe (Rowe, 1996). The second digit of the hand is reduced in length (Ankel-Simons, 2000). This species has powerful grasping hands and feet (Ankel-Simons, 2000). The tail of the pygmy loris is reduced and serves no function (Rowe, 1996). In the female the vulva is closed until estrus. The average body mass for an adult pygmy loris is about 500 grams (Ratajszczak, 1998).
This species is found in the following countries: Cambodia, China, Laos, Thailand, and Vietnam. In Vietnam the pygmy loris has found to live in primary rainforest on limestone, secondary forests, and bamboo thickets (Ratajszczak, 1998). In Laos this species lives in dense evergreen forest (Ratajszczak, 1998). This species is found in altitudes up to 1500 meters (MacKinnon and MacKinnon, 1987).
This is an insectivorous species that also eats fruits, birds' eggs and chicks, geckos, and arboreal small mammals (Ratajszczak, 1998). Gums may also be part of the diet of the pygmy loris (Tan, 1994). During times when insects are rare and the temperature is colder this species may enter into torpor and live off of fat reserves (Ratajszczak, 1998). This is a nocturnal and an arboreal species.
As opposed to the slow loris, Nycticebus coucang, the pygmy loris does not employ the same slow quadrupedal locomotion, rather it moves with a rapid and smooth hand-over-hand type quadrupedal run (Duckworth, 1994).