Silvery gibbon, Javan gibbon
Hylobates moloch

Adult gibbons

This gibbon is of mostly siverly grey colour. A sharp whiteish brow band and a distinct white goatee beard are typical of this species.

Adult silvery gibbons exhibit a moderate degree of sexual dichromatism: Females often have a distinct dark cap and ventral area, whereas these areas are often less contrastingly dark in males.

Adult male "Paul", Munich Zoo Hellabrunn, Germany, 21 June 1988. This male is the father of the immature gibbons shown below.	Adult male "Omar", Howletts Zoo, England, 16 Oct. 1988.	Adult male "Iwanowitsch", Berlin Zoo, Germany, 1 July 1988.
Wild young adult male, Linggo Asri, Dieng, Central Java, 1 Oct. 1998.	Adult male "Hilo", Howletts Zoo, England, 10 Sept. 2004 (Phot.: Lucy Birkett).
Adult female "Paula", Munich Zoo Hellabrunn, Germany, 17 July 1987.	Adult female, Ragunan Zoo, Jakarta, Indonesia, 11 Sept. 1998. Singing.	Adult female, Zoo No. 185/2", Paignton Zoo, England, 22 Oct. 1988. This female has an unusual brown-grey tint. Even the cap is not black, but sepia.
Adult female "Ludmilla", Munich Zoo Hellabrunn, Germany, 10 May 1988.	Adult female "Paula", Berlin Zoo, Germany, 1 July 1988. This female exhibits a particularly contrasting black cap and a black belly. She is not identical with the female of the same at Munich Zoo shown above.
Adult female "Marlene", Howletts Zoo, England, 10 Sept. 2004 (Phot.: Lucy Birkett).

Immature gibbons

Immature silvery gibbons may be slightly paler than adult ones. They usually show no dark ventral area and the cap is usually absent or only slightly darker than the rest of the body.

Juvenile male "Paulus", born on 24 July 1984, Munich Zoo Hellabrunn, Germany, 17 July 1987.	Juvenile male "Paulus", born on 24 July 1984, Munich Zoo Hellabrunn, Germany, 11 Feb. 1988.	Subadult male "Paulus", born on 5 July 1988, Munich Zoo Hellabrunn, Germany, 27 Aug. 1992.
Young adult male "Paulus", born on 5 July 1988, Munich Zoo Hellabrunn, Germany, 28 April 1995. This gibbon is adult and living on the same island as his father. The son's cap is still lighter in colour than the father's (see first photograph).