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They differ from the other langurs by characteristics in the shape of their head (particularly the poorly developed or absent brow ridges, and the prominent nasal bones), [2] in the teeth, and by the size of their small thumbs. Surilis range in adult length from 40 to 60 cm (with a 50- to 85-cm-long tail) and a weight of 5 to 8 kg.
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.
Miller's langur (Presbytis canicrus), also known as Miller's grizzled langur or Kutai grey langur, is a species of leaf monkey. It is endemic to East Kalimantan on the island of Borneo in Indonesia. It is one of the world's most endangered primates, and was at one time thought to be extinct, until it was rediscovered in 2012.
Semnopithecus is a genus of Old World monkeys native to the Indian subcontinent, with all species with the exception of two being commonly known as gray langurs. [1] Traditionally only the species Semnopithecus entellus was recognized, but since about 2001 additional species have been recognized.
Trachypithecus (derived from Greek τραχύς, trachýs meaning "rough" and πίθηκος, píthekos meaning "monkey") is a genus of Old World monkeys containing species known as lutungs, langurs, or leaf monkeys. Their range is much of Southeast Asia (northeast India, Vietnam, southern China, Borneo, Thailand, Java, and Bali).
Female langurs hold a pregnancy for 195–210 days, and after the birth the offsprings are taken closely cared for by the mother until they are about 12–20 weeks old. Western purple-faced langurs are tree-dwelling animals, and live in groups of up to 14, where a harem of female monkeys, their offsprings and a male in a position of superiority ...
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Tufted gray langurs communicate with many different ways such as barks, grunts, whoops, whistles and howls. The cough like voice is used for giving tension, and whistling for the contact loss with the troop. [4] The tufted gray langur monkey's superior eyesight and ability to sit atop high trees allows it to spot predators easily.