Presbytis melalophos, also known as the black-crested langur or Sumatran surili, is a species of Old World monkey found in Southeast Asia, specifically on the island of Sumatra in Indonesia, as well as in the nearby Malay Peninsula and some surrounding islands.

Here are some key facts about Presbytis melalophos:

Appearance: The black-crested langur is a medium-sized monkey with distinctive black fur on its head, which gives it its name "black-crested." The rest of its body is generally grayish in color.

Diet: These langurs are primarily herbivores, feeding on a variety of leaves, fruits, flowers, and seeds.

Habitat: They inhabit various forest types, including primary rainforests, secondary forests, and swamp forests.

Behavior: Black-crested langurs are social animals and live in groups called troops. Troops can consist of several individuals and are usually led by a dominant male.

Conservation Status: The black-crested langur is listed as "Vulnerable" on the International Union for Conservation of Nature (IUCN) Red List. Their population is declining due to habitat loss, primarily from deforestation and agricultural expansion, as well as hunting for their meat and fur.

Efforts are being made to protect their habitats and conserve the species, but they continue to face threats from human activities and encroachment on their natural environment. Conservation organizations and researchers are working to better understand and protect these beautiful primates to ensure their survival in the wild.

As always, for the most current and detailed information about Presbytis melalophos, I recommend referring to recent research papers, conservation organizations' websites, or updated sources from reputable wildlife authorities.

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