The eastern grey gibbon or northern grey gibbon (''Hylobates funereus'') is a primate in the

gibbon Gibbons () are apes in the family Hylobatidae (). The family historically contained one genus, but now is split into four extant genera and 20 species. Gibbons live in subtropical and tropical rainforest from eastern Bangladesh to Northeast India ...

family,

Hylobatidae Gibbons () are apes in the family Hylobatidae (). The family historically contained one genus, but now is split into four extant genera and 20 species. Gibbons live in subtropical and tropical rainforest from eastern Bangladesh to Northeast India ...

Taxonomy

Formerly, the eastern grey gibbon and

western grey gibbon The western grey gibbon (''Hylobates abbotti''), also known as Abbot's grey gibbon, is a primate in the gibbon family, Hylobatidae. It was named after zoologist William Louis Abbott. Taxonomy Formerly, the western grey gibbon and northern grey ...

(''H. abbotti'') were considered conspecific with the southern grey gibbon (''H. muelleri''), but more recent studies indicate that all three are distinct species, and both the IUCN Red List and the

American Society of Mammalogists The American Society of Mammalogists (ASM) was founded in 1919. Its primary purpose is to encourage the study of mammals, and professions studying them. There are over 4,500 members of this society, and they are primarily professional scientists ...

consider them such. However, they can still hybridize with one another where their ranges meet.

Distribution

It is endemic to northeastern Borneo, and is found in

Kalimantan Kalimantan () is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area. The non-Indonesian parts of Borneo are Brunei and East Malaysia. In Indonesia, "Kalimantan" refers to the whole island of Borneo. In 2019, ...

, Sarawak, and Brunei. It ranges from Sabah south to the

Mahakam River The Mahakam River (Indonesian: ''Sungai Mahakam'') is third longest and volume discharge river in Borneo after Kapuas River and Barito River, it is located in Kalimantan, Indonesia. It flows from the district of Long Apari in the highlands of ...

in East Kalimantan, and west to Baram in Sarawak.

Conservation

As with the other two grey gibbons, this species is thought to be endangered due to heavy deforestation in Borneo, as well as increases in forest fires exacerbated by El Niño events. It is also threatened by illegal hunting and capture for the pet trade.

References

{{Taxonbar, from=Q29578698 Eastern gray gibbon Primates of Indonesia Endemic fauna of Borneo Mammals of Borneo Mammals of Indonesia Mammals of Brunei Mammals of Malaysia Endangered fauna of Asia Species endangered by the pet trade Eastern gray gibbon Taxa named by Isidore Geoffroy Saint-Hilaire