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Hoolock gibbons[1][2]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Hylobatidae
Genus: Hoolock
Mootnick & Groves, 2005

Hoolock hoolock
Hoolock leuconedys

The hoolock gibbons (Hoolock), also known as hoolocks, are two primate species from the family of the gibbons (Hylobatidae).

Hoolocks are the second largest of the gibbons, after the Siamang. They reach a size of 60 to 90 cm and weigh 6 to 9 kg. The sexes are about the same size, but they differ considerably in coloration: males are black colored with remarkable white brows, while females have a grey-brown fur, which is darker at the chest and neck. White rings around the eyes and around the mouth give their face a mask-like appearance.

The range of the hoolocks is the most northwestern of all the gibbons, extending from Assam in North-East India, to Myanmar. Small populations (in each case few hundred animals) live also in the eastern Bangladesh and in southwest China. Like the other gibbons, they are diurnal and arboreal, brachiating through the trees with their long arms. They live together in monogamous pairs, which stake out a territory. Their calls serve to locate family members and ward off other gibbons from their territory. Their diet consists mainly of fruits, insects and leaves.

Young hoolocks are born after a seven month gestation, with a milky white fur. After about six months their fur turns black. After 8 to 9 years they are fully mature and their fur reaches its final coloration. Their life expectancy in the wild is about 25 years.


The classification of this gibbon has changed several times in the past few years. Classically, all gibbons were classified in the genus Hylobates, with the exception of the Siamang. After some studies, the genus was divided into three subgenera (including the Siamang's Symphalangus), and then into four (recognizing Bunopithecus as the hoolock subgenus distinct from other gibbon subgenera). These four subgenera were elevated to full genus status. However, the type species for Bunopithecus is Bunopithecus sericus, an extinct gibbon or gibbon-like ape from Sichuan, China. Very recent investigations have shown that the hoolocks are not closely related to B. sericus and so have been placed in their own genus, Hoolock. In the process, the two subspecies of hoolocks have been raised to species level.[1][2]

There are two species of Hoolock:[2]


  1. ^ a b Groves, C. (2005). Wilson, D. E., & Reeder, D. M.. ed. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 178-179. ISBN 0-801-88221-4.  
  2. ^ a b c Mootnick, A.; Groves, C. P. (2005). "A new generic name for the hoolock gibbon (Hylobatidae)". International Journal of Primatology 26 (26): 971–976. doi:10.1007/s10764-005-5332-4.  

External links



Up to date as of January 23, 2010

From Wikispecies



Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Mammalia
Subclassis: Theria
Infraclassis: Placentalia
Ordo: Primates
Subordo: Haplorrhini
Infraordo: Simiiformes
Parvordo: Catarrhini
Superfamilia: Hominoidea
Familia: Hylobatidae
Genus: Hoolock
Species: H. hoolock - H. leuconedys


Hoolock Mootnick and Groves, 2005

Type species


  • Mootnick & Groves 2005: A new generic name for the hoolock gibbon (Hylobatidae). International journal of primatology, 26: 971-976.

Vernacular names

English: Hoolock gibbon
한국어: 흰눈썹긴팔원숭이속
日本語: フーロックテナガザル属


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