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The purple-faced langur (Semnopithecus vetulus),[1] also known as the purple-faced leaf monkey, is a species of Old World monkey that is endemic to Sri Lanka. The animal is a long-tailed arboreal species, identified by a mostly brown appearance, dark face (with paler lower face) and a very shy nature. The species was once highly prevalent, found in suburban Colombo and the “wet zone” villages (areas with high temperatures and high humidity throughout the year, whilst rain deluges occur during the monsoon seasons), but rapid urbanization has led to a significant decrease in the population level of the monkeys.
In the purple-faced langur, males are usually larger than females. Males measure 50 to 67.1 cm (19.7 to 26.4 in) in head-body length with a tail of 67 to 85.1 cm (26.4 to 33.5 in). Females possess a head-body length 44.7 to 60 cm (17.6 to 23.6 in) and tail length of 58.9 to 82 cm (23.2 to 32.3 in). The pelage may generally vary from blackish to grayish. The species tends to have whitish to gray short ‘trousers’ rounded off by purplish-black faces with white sideburns.
Part of the back is covered with whitish fur, and tail is also furred with black and white mixed colors. The feet and hands are also purplish-black in color. Size varies among the subspecies. Typically adults will weigh somewhere between 3.1 and 11.4 kg (6.8 and 25.1 lb), averaging about 7.08 kg (15.6 lb). The smallest subspecies (S. v. nestor) commonly weighs between 3.8 and 6 kg (8.4 and 13.2 lb).[9] Average weight from other subspecies has been recorded up to 7.8 kg (17 lb) in females and 8.5 kg (19 lb) in males with some exceptionally big langurs weighing up to perhaps 18 kg (40 lb).
Among the primates that live in Sri Lanka, it is somewhat smaller than the tufted gray langur despite leading males of the group of purple-faced langurs often being larger than the tufted gray langur that lived together in the habitats. In the subspecies known as the “bear monkey” (S. v. monitcola) usually has a darker coat and usually sports a heavy mustache. In this species, the hair of crown directed backwards throughout, not radiating. it lacks the crest of tufted gray langurs and has hair on the crown no longer than on temples and nape. Purple-faced langurs have a rump that is pure white or whitish gray.
This image was taken in Sri Lanka
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