Trachypithecus auratus,

Javan Lutung (scientific name: Trachypithecus auratus) is called Javan Lutung in foreign language. There are two subspecies.

Javan Lutung mainly lives in trees. They like to live in groups, usually 3-10 in each group, and the larger group has about 20. They usually move and feed in the upper layers of trees, rarely go to the ground, have certain activity patterns and relatively fixed residences, and their activity range is about 3-5 square kilometers. Led by a male monkey, they forage in the morning and afternoon and rest at noon. They sleep in trees or caves at night.

Javan leaf monkeys are agile and light, good at climbing and jumping. They are particularly active in the morning and evening, and live in natural caves between cliffs at night. They are very vigilant. Before entering the cave at dusk every day, the male monkey who serves as the leader of the group will enter the cave first to observe. When no abnormalities are found, other members will enter in turn. The last to enter the cave are pregnant females with cubs. Among them, the Javan leaf monkeys living in the northern part of the distribution area have long and dense hair, and in winter, thick fat accumulates under the skin, so they have strong cold resistance.

The main food of the Javan leaf monkey is leaves, flower buds and wild fruits, and occasionally eat insects and other small animals.

The breeding season of the Javan leaf monkey is not very obvious. It usually mates in February and March, with a gestation period of about 160 days, giving birth in August and September, and a lactation period of about 6 months. Adult female monkeys generally give birth to one baby per year, and it is rare to see two babies. Sexual maturity is 4-5 years old.

Listed in the 2012 Red List of Threatened Species of the World Conservation Union (IUCN) ver 3.1 - Least Concern (LC).

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Distributed in Indonesia (Bali, Java, Kalimantan, Sumatra).
Javan leaf monkeys live in tropical and subtropical areas with lush forests, thick bushes, steep mountains, limestone areas with many caves, and sometimes in hilly areas.

The Javan leaf monkey has a head and body length of 44-65 cm, a very long tail of 61-87 cm, and an average weight of 7 kg. It has a slender body, with a black upright crown of hair on the top of the head; white hair from the cheeks to the base of the ears; the adult body is jet black, with long, thick and shiny hair. The hands and feet have black flat nails; the tip of the tail is white.
There are two subspecies: the nominate subspecies and the western subspecies, which have different colors. The nominate subspecies has a black luster, with edges on both sides of the body and a slight brown tint on the legs. The skin of the face, palms and soles is black. There are also a few individuals with dark orange hair color, yellow hair on both sides of the body, black hair on the limbs, around the ears and back. The western subspecies, also known as the West Javan leaf monkey, has a smooth black color with a very slight brown tint on both sides of the body and legs. The back of the female J