There are 3 species of black gibbon, namely, 1) H.c. concolor, 2) H.c. leucogenys, and 3) H.c. gabrieliae. The specie of H.c. concolor can be found in Hainan. Male is purely black in color. At its face, there are white hairs spread around eyes, nose, and mouth. Female is light in color with black spot patched at the center of the head top. The specie of H.c. leucogenys can be found in Lao and Northern Vietnam. Male is black in color with white spot at its cheek. Female is light or gold in color with black spot patched at chest and the center of the head top. The specie of H.c. gabrieliae can be found in the Southern part of Vietnam bordered to Cambodia. Male is purely black in color but it also has red-gold hair scattered around. It has white marking spots at its face and cheek. Female black gibbon is light in color with black spot distinctively patched at chest. It has distinctive black hair pointed up at the head. Newborn black gibbon is gold in color. When it is 6 – 8 months, its hands, feet, and head is changed to black in color. After that the color of both male and female is changed into pure black. Its cheek will have white color when it is 6 – 7 years. For female, its color will turn into gold or light color. For H.c. leucogenys, its chest is black in color but for H.c. gabrieliae, its chest is also black in color and its hair is pointed up on its head. When standing, black gibbon does not bend its knees unlike any other gibbons. Male has larynx, which makes it bawl intermittently and persistently. Female does not have larynx. Thus, the bawl is different from that of male. Sexual organ of both male and female has cartilage bone inside. Thus, it is difficult to specify its sex when it is young or when its body hair is still black. Thus, to specify sex, its testis is an indicator. One that has testis is a male.
It is found in Lao, Indochina, Hainan, and Thailand. In Thailand, it is found in Loei at Chiang Kan district. It is a hardly found gibbon.
It eats fruits, treetops, bird eggs, and insects.
It likes to swing from branch to branch not running on trees. It stays on high trees all day. In order to drink water, it uses back finger to touch on water and suck on it or sometimes uses its tongue to lick in a small swamp. It likes staying in sunlight during early morning on the trees. During daytime or afternoon, where the weather is extremely hot, it will move down from the trees to avoid sunlight. When it is frightened, it swings quickly from branch to branch and hinds within dense shrubs. The important enemies of black gibbon are hawks and pythons.
It can live up to 30 years.
It is mature and ready for mating at the age of 7 – 8 years. Gestation period is around 240 days. One litter contains only one young. Young black gibbon weans when it is 4 – 7 months and stays with its mother until it is 2 years old. Then, it will separate and live on its own.
Update : 11 April 2017