According to current literature, five species of non-human primates live in Sri Lanka viz. Purple faced leaf monkey Semnopithecus vetulus, Torque macaque Macaca sinica, Gray langure (Semnopithecus priam) and two species of Slender loris (Loris tardigradus and Loris lydekkerianus). The Purple faced leaf monkey is endemic to Sri Lanka and it’s classified as endangered species (IUCN 2004). Currently recognized four subspecies viz. Southern Purple faced leaf monkey Semnopithecus vetulus vetulus, Western Purple faced leaf monkey Semnopithecus vetulus nestor (has been included on the Top 25 Most Endangered Primates list), Bear Monkey Semnopithecus vetulus monticola, and Northern Purple faced leaf monkey Semnopithecus vetulus philbricki. The Torque macaque is endemic to Sri Lanka and it’s classified as vulnerable species (IUCN 2004). Currently three subspecies are recognized viz. Red torque macaque Macaca sinica sinica, Dusky toque macaque Macaca sinica aurifrons, and Montane torque macaque Macaca sinica opisthomelas.The Gray Langur (Semnopithecus priam) is common through out the whole Indian peninsula and the sub species Ceylon Grey Langur (Semnopithecus priam thersites) is peculiar to Southern India and Sri Lanka. Sri Lanka is home to two species of slender Loris (Loris tardigradus and Loris lydekkerianus), with four currently recognized subspecies; all of the subspecies are endemic to Sri Lanka.