The gray snub-nosed monkey, also known as Brelich's snub-nosed monkey, Guizhou snub-nosed monkey, and Guizhou golden monkey, is a species of primate in the family Cercopithecidae. It is endemic to China, where it is known as the Guizhou golden hair monkey or gray golden hair monkey. It is threatened by habitat loss. Of the three species of snub-nosed monkeys in China, the gray snub-nosed monkey is the most threatened, with a total population of less than 750 in around 20 groups surviving in the wild.
Description
Adults are covered with long, fine hair, generally grading from brown on its upper body to gray on its lower body, with a white patch between its shoulder blades. Its head, neck, and ends of its limbs are black, except for a golden brow. It has a golden chest, and chestnut fur on its inner knees and inner sides of its upper arms. Its face is bare bluish-white skin, pink around the eyes and mouth, and has a shelf-like brow and reduced nasal bones, giving it a snub-nosed appearance. Juveniles are shades of gray with patterns changing with age. Adult males are brighter colored than adult females, and have white skin on prominent nipples. Size data is limited, but two adult male specimens weighed 14.5 kg on average, and an adult female specimen weighed 8 kg, with adult length excluding tail ranging from 64–73 cm, and tail length ranging from 70–97 cm.
Its habitat consists of mixed deciduous and evergreen broadleaf forests, including secondary forest, but not coniferous forest. The forests include mono-groves of Asian oak and beech, as well as mixed species forests that include cherry, maple, Rhododendron spp, and birch trees. It lives at elevations of 1,400–2,300 m in summers down to 570 m at times of heavy snow cover. They are thought to utilize most of the available range of the nature reserve. The yearly rainfall in the area above 1,600 m elevation is above 2000 mm. Snow is common in the winter, with sub-freezing temperatures about five months of the year, though monthly mean temperatures are never below 0 °C.
Behavior
The diurnal species is considered semi-terrestrial, primarily inhabits trees where available. Locomotion includes a mix of "quadrupedal walking, climbing, leaping, semi-brachiation and occasional full brachiation." It feeds on a variety of young leaves, leaf and flower buds, bark, fruits, certain petioles, seeds, and insect larvae. Seasonality of the forest means the monkey's diet changes seasonally as well; it may be 7% leaves in the first three months of the year, and 93% in the next three. Fruits and seeds can constitute 35% of the diet in July to September. Its social structure is based on small groups that band together into larger troops of up to 400 or more individuals, traveling, feeding and sleeping. The groups typically have 5–10 members, comprising one dominant male and several females and their young. There are also all-male bachelor groups of two to five adult or sub-adult males, which typically mill about the periphery of a troop. The groups split into large or smaller bands seasonally.
Conservation status
Though legally protected, the gray snub-nosed monkey is threatened seriously due to habitat loss from forest clearing, illegal mining, non-targeted hunting, and occasional inadvertent snare trapping. A 2008 census located around 750 individuals, consistent with a 2005 census. The Fanjing reserve that covers the distribution range was not established until 1978, and centuries of mining activities have depleted the forest on the northern slope of the mountains; ongoing reforestation efforts haven't been able to restore the forest to the level of sustaining the ideal survival environment for the monkeys.
