As arboreal primates, northern gray gibbons spend the majority of their time in the forest canopy, rarely descending to the ground. They prefer mature primary and secondary forests, including Borneo's tropical evergreen dipterocarp forests, which provide them with safety and abundant fruit.
The Northern Grey Gibbon (Hylobates funereus) [also known as North Borneo Gibbon] is a small species of gibbon endemic to the tropical rainforests of northern and eastern Borneo. This species was previously considered a subspecies of Mueller’s Gibbon (Hylobates muelleri funereus) [ aka Bornean Gibbon] but has recently been recognized as a distinct species.
Similar to other gibbon species, Northern Grey Gibbons are highly vocal. The ‘great call’ of the female is characterized by accelerating whoops followed by a rapid series of bubbly notes. Male-female duets are an iconic sound of the Bornean rainforest at dawn.
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