Agile gibbon

Hylobates agilis

TAXONOMY

Hylobates agilis Cuvier, 1821, west Sumatra, Indonesia. Three subspecies: in the Malay Peninsula (H. a. unko); in most of Sumatra (H. a. agilis); in southwest Borneo (Kalimantan) (H. a. albibarbis)

OTHER COMMON NAMES

English: Dark-handed gibbon; French: Gibbon agile; German: Schwarzhand-Gibbon.

PHYSICAL CHARACTERISTICS

Size 16.5-18.5 in (42-47 cm); female 12.2-14.1 lb (5.55-6.4 kg). Polychromatic, dark brown, almost black to light buff,

Agile Gibbon

through to brown and golden. Male, white eyebrows and whitish cheeks; female, white eyebrows; young, complete white face ring. Grayer and darker on cap and chest in Borneo.

DISTRIBUTION

Malay Peninsula, north of Mudah and Kelantan Rivers into southern Thailand; Sumatra, south of Lake Toba; southwest Borneo (Kalimantan Barat ande Tengah), south of Kapuas River and west of Barito River.

HABITAT

Tropical evergreen rainforest. BEHAVIOR

Population density 4.3 groups/2.5 mi2 (km2); home range 72 ac (29 ha), 76% defended as territory: 54 ac (22 ha); day range 0.8 mi (1.3 km). Male, diphasic hoots; female, great call, eight notes, shorter, higher pitched, rising notes, stable climax, 15 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

Elusive, respected, popular as pet in some areas. ♦

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