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Adult male "Iaman", Zürich Zoo, Switzerland, 13 Aug. 2007. This old male's face ring is strongly reduced, when compared to the photographs made 20 years earlier of the same male (see further below).
Adult male, Phnom Tamao Zoo, Cambodia, 13 Sept. 2006. This male still retains a broad face ring and a broad corona, suggesting that he may be young adult.	Adult male, Phnom Tamao Zoo, Cambodia, 14 Sept. 2006.	Adult male, Phnom Tamao Zoo, Cambodia, 15 Sept. 2006. This male still retains a gray lower back, suggesting that he may be young adult.
Adult male, probably "Iaman", Zürich Zoo, Switzerland, 28 Oct. 1987. On this photograph, the white genital tuft, which is typical of adult males of this species, is visible.	Adult male "Iaman", Zürich Zoo, Switzerland, 17 Nov. 1987.	Adult male "Khmer", Zürich Zoo, Switzerland, 30 July 2006.
Adult male "Blacky", Zürich Zoo, Switzerland, 28 April 1982. Notice the grey corona, the light digits and the white genital tuft of this sexually dichromatic species.		Adult male "Itam", Zürich Zoo, Switzerland, 3 Nov. 1983. This male exhibits a particularly broad and light corona and also has some grey hairs on the lower back and on the distal leg. This is part of the normal variability of this species. The male shown here is fully adult and not a hybrid with H. lar (Geissmann, unpublished vocal data).
Adult female, Phnom Tamao Zoo, Cambodia, 15 Sept. 2006. Calling.	Adult female, Phnom Tamao Zoo, Cambodia, 15 Sept. 2006. Same female as in previous photograph, still calling. Notice the contrasting black cap and ventral field, and light temple fringes hanging down over the black cheek region and ears.	Adult male "Willow", Zürich Zoo, Switzerland, 13 Aug. 2007. Adult female pileated gibbons often develop a bald forehead.
Adult female, Berlin Zoo, Germany, 08 July 2005.	Adult female, Phnom Tamao Zoo, Cambodia, 13 Sept. 2006.	Adult female, Phnom Tamao Zoo, Cambodia, 14 Sept. 2006.
Adult female "Marijke", Twycross Zoo, United Kingdom, 6 Oct. 1988.	Adult female "Elf", Twycross Zoo, United Kingdom, 4 Oct. 1988. This female exhibits only traces of a white brow band. It is possible that the reduction of the brow band in female pileated gibbons correlates with age.	Adult female, Dusit Zoo, Bangkok, Thailand, 30 March 1999.
Adult female "Iok", Zürich Zoo, Switzerland, 30 Aug. 1989.	Adult female "Iok", Zürich Zoo, Switzerland, 3 Nov. 1983.	Adult female "Grey", Zürich Zoo, Switzerland, 25 Aug. 1984.

Infant, less than 2 months old (born 23 July 2007), Zürich Zoo, Switzerland, 13 Aug. 2007. Notice moderate development of fur on arms and ventrum (pink areas on photograph).	Infant male "Nong" (hardly 3 months old) together with his mother "Iba" and juvenile brother "Khmer", Zürich Zoo, Switzerland, 9 Aug. 1983. This infant's neonatal coat is of light grey colour without any dark patterns.	Infant female "Gandis" (3 and a half months olf) and her mother "Iba", Zürich Zoo, Switzerland, 30 July 2006.
Infant male "Ili" (5 months old), Zürich Zoo, Switzerland, 9 Aug. 1983. This infant still exhibits the neonatal coat.
Infant male "Djantung" (1 year 8 months old, together with mother "Willow", Zürich Zoo, Switzerland, 1 June 2005.	Infant male "Khmer" (1 year and 8 months old) together with his mother "Iba", Zürich Zoo, Switzerland, 15 July 1986. Traces of darker fur are already visible on the infant's chest.	Juvenile male "Fayar" (2 years 2 months old), Zürich Zoo, Switzerland, 13 Aug. 2007. This male's lower ventrum is black.
Juvenile male "Emas" (2 years 5 months old), Zürich Zoo, Switzerland, 30 July 2006. This male exhibits the fully developed juvenile coat with a contrasting black cap and black ventral field.	Juvenile male "Quang" (2 years and 6 months old), Zürich Zoo, Switzerland, 15 Jan. 1993.	Juvenile male "Khmer" (2 years and 11 months old) together with his mother "Iba", Zürich Zoo, Switzerland, 28 Oct. 1987.
Juvenile male "Chamoa" (3 years 4 months ofl), Zürich Zoo, Switzerland, 1 June 2005.	Juvenile female "Holly" (3 years and 4 months old), Twycross Zoo, United Kingdom, 3 Oct. 1988.	Juvenile, Phnom Tamao Zoo, Cambodia, 15 Sept. 2006.
Juvenile, Phnom Tamao Zoo, Cambodia, 15 Sept. 2006. This pileated gibbon exhibits an unusualy high and narrow face.	Juvenile male "Pipin Fabian" (3 years and 9 months old), Zürich Zoo, Switzerland, 28 Oct. 1987.	Juvenile/subadult male, Phnom Tamao Zoo, Cambodia, 14 Sept. 2006.
Subadult male "Khmer" (4 years and 5 months old), Zürich Zoo, Switzerland, 29 April 1989. Subadult males exhibit a progressive darkening of the whole ventral area and inner parts of arms and legs.	Subadult male "Chamoa" (4 years 6 months old), Zürich Zoo, Switzerland, 13 Aug. 2007.
Subadult male "Khmer", Zürich Zoo, Switzerland, 3 Jan. 1990. This male is 5 years and 3 months old. The whole ventral area is largely black now. The genital tuft has grown in length and remains white.	Subadult male "Pipin Fabian", Zürich Zoo, Switzerland, 30 Aug. 1989. This male is 5 years and 7 months old. Although its ventral areas are very dark, the dorsal areas are still grey.	Young adult male "Pipin Fabian", Zürich Zoo, Switzerland, 15 Oct. 1991. This male is 7 years and 9 months old and considered adult. Yet, traces of grey fur colouration can still be seen on the distal legs and (not visible on this photograph) on parts of the back.