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Grizzled Leaf Monkey
From Wikipedia, the free encyclopedia. (Redirected from Presbytis comata)

The Grizzled Leaf Monkey (Presbytis comata) is an endangered species endemic to the western half of Java, Indonesia, a biodiversity hotspot. Other common names by which it is known by include Gray, Grizzled or Sunda Island Sureli; Grizzled or Stripe-crested Langur; Javan Grizzled Langur; Java or Javan Leaf Monkey; Langur Gris.

There are two subspecies of the grizzled leaf monkey:
 * Presbytis comata comata - Occurs in Western Java
 * Presbytis comata fredericae - Occurs in Central Java

This species has a sacculated stomach to assist the breakdown in the cellulose from the leaves they feed on. They have small, slender faces, tails and large round stomachs. Their coloring ranges from dark gray to white. Leaf monkeys tend to be active during the day, spending up to 5 hours grooming themselves.

Distribution
The grizzled leaf monkey is found in the western half of Java, Indonesia. It ranges as far east as Mt. Lawu on the border with East Java. In a recent study, Meijaard and Groves discovered that this species is mostly confined to Sundaland due to changes in the geography, sea level and vegetation that occurred during the Pleistocene era, and partly due to the type of vegetation and soil there today. The grizzled leaf monkey lives in primary and secondary lowland rainforests, with an altitudnal range of 2500 meters.

Ecology
The grizzled leaf monkey mostly consumes leaves, however, will also consume flowers, fruits, and seeds. This species appears to be more folivorous than any other member of the Presbytis genus, with over 62% of their overall diet composed of young leaves and 6% of mature leaves.

Conservation
This species is currently listed on the IUCN red list of endangered species because of habitat loss due to human activity. It is estimated that fewer than 1,000 exist today in their natural habitat and only 4% of their natural habitat remains. Most of the loss of their original habitat is due to the clearing of the rainforests in Indonesia. Only 4% of their original habitat remains and the population has decreased by at least 50% in the last ten years. According to Nijman (1997), of the two subspecies of P. comata, the P. frediricae is among the rarest and most at risk for extinction, located in one of the most highly populated areas on the island and near an active volcano.