Trachypithecus barbei

Burmese black leaf monkey (scientific name: Trachypithecus barbei) foreign name Tenasserim Lutung.

Burmese black leaf monkey mainly lives in trees. They like to live in groups, in small groups, usually 3-10 in each group, and larger groups have 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. They are agile and light, good at climbing and jumping, especially 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.

The Burmese black leaf monkey has an unclear breeding season. It usually mates in February and March, with a gestation period of about 160 days and gives birth in August and September. Adult female monkeys usually give birth to one baby per year and reach sexual maturity at 4-5 years old.

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Distributed in a small area between 14°00'-15°15'N, 98°00'-98°25'E on the border between Myanmar and Thailand. A few records in Yunnan (Hekou and Xishuangbanna); extends to Myanmar and northern Indochina.

The head and body length of the Burmese leaf monkey is 52-62 cm; the tail is 60-88 cm long; the weight is 6-9 kg. The back is brown, almost black; the legs and tail are darker black-gray, with no black at the tip of the tail; the abdomen is pale (gray). There are asymmetrical white spots on the skin on the inner thighs of females. The vertical hair on the top of the head forms a distinct crown. The upper lip has sparse white hair, the lower lip has black hair, and the lips are light blue-black; the face has a mild violet color.