Muellers gibbon

Hylobates muelleri

TAXONOMY

Hylobates muelleri Martin, 1841, Kalimantan, Indonesia. Three subspecies around northern and eastern Borneo (H. m. abbotti H. funereus, and H. muelleri).

OTHER COMMON NAMES

English: Bornean gibbon, gray gibbon; French: Gibbon de Mueller; German: Grauer-Gibbon, Borneo-Gibbon; Spanish: Gibon de Mueller.

PHYSICAL CHARACTERISTICS

Size 16.5-18.5 in (42-47 cm); weight 12.6 lb (5.7 kg). Brown to gray with dark cap and chest, more so in female; face ring in male.

DISTRIBUTION

Borneo, north of Kapuas River in west Kalimantan, Sarawak, Sabah, and east and central Kalimantan, east of Barito River.

HABITAT

Tropical evergreen rainforest.

BEHAVIOR

Population density 3.2 groups/2.5 mi2 (km2); home range 109 ac (44 ha), 89% defended as territory 96 ac (39 ha); day range 0.5 mi (0.9 km). Male, single hoots; female, short, rising notes, short bubble, about 58 notes, 12 seconds.

FEEDING ECOLOGY AND DIET

Diet is mainly fruit, including figs, also flowers, leaves, and animal matter.

REPRODUCTIVE BIOLOGY

Monogamous. Produce single young every two to three years.

CONSERVATION STATUS

Lower Risk/Near Threatened.

SIGNIFICANCE TO HUMANS

Mostly revered, especially by the indigenous people, but probably eaten; traded by some non-indigenous visitors. ♦

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