Photo Gallery: Symphalangus syndactylus

Siamang
Symphalangus syndactylus

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Adult siamangs

Siamang (Symphalangus syndactylus)

Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 22 Aug. 2008.

Adult male "Wim" calling, Zürich Zoo, Switzerland, 1 June 2005. Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008. Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008.

Siamang (Symphalangus syndactylus)

Adult male "Narong", Zürich Zoo, Switzerland, 27 June 1981. Adult female "Gaspa", Zürich Zoo, Switzerland, 16 March 1981.

Adult male "Festus", Metro Zoo, Miami, U.S.A., 31 July 1988. Adult female "Hexe", Duisburg Zoo, Germany, 21 June 1988.
The whitish brow band in this female is a very rare trait of males and females of this species. Its occurrence suggests that ancestral forms had a white face ring (Geissmann, T., 2003: Circumfacial marking in siamang and evolution of the face ring in the Hylobatidae. Int. J.Primatol. 24: 143-158. Read this paper here).

Siamang (Symphalangus syndactylus)

Adult male "Kajang", Twycross Zoo, U.K., 3 Oct. 1988.
This male also exhibits a variant of the light brow band. Adult female "Püppi II" (left) and her father "Piet" (right), Duisburg Zoo, Germany, 21 June 1987.
This female also shows a light brow band like her mother ("Hexe", shown above).

Siamang (Symphalangus syndactylus)

Adult male "Otto", Zoo Doué-la-Fontaine, France, 28 May 1988. Adult male "Otto", Zoo Hellabrunn, Munich, Germany, 24 July 1982.
This male exhibits an acrobatic display which is characteristic for a particular part of the duet song's great call sequence.

Siamang (Symphalangus syndactylus)

Adult female (left) and adult male, Taman Safari Zoo, Cisarua, Java, Indonesia, 20 Sept. 1998.
Adult pair during a duet song bout. Notice (incompletely) inflated throat sacs. Adult pair "Hexe" (left) and "Piet" (right), Duisburg Zoo, Germany, 21 June 1987.
Another pair during a duet song bout. The throat sac of the male is fully inflated.

Immature siamangs

Siamang mother with twins (Symphalangus syndactylus) Siamang (Symphalangus syndactylus)

Infant twins (1 male, 1 female), hardly 2 months old, with their mother "Chandra", Zürich Zoo, Switzerland, 30 June 1992. Infant female "Trine", Duisburg Zoo, Germany, 11 weeks old, Dec. 1974. Phot. Dr. Jesse.
This infant not only exhibits the early stages of a light brow band pattern, but also a light corona, which disappeared later during this siamang's life. A photograph of this female as an adult can be found further above. Infant male (3 months old), Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008.

Siamang (Symphalangus syndactylus)

Infant male, 5 months old, with his mother "Manga", Hellabrunn Zoo, Munich, Germany, 28 April 1995.

Infant male, 5.5 months old, with his mother "Liseli", Seeteufel Zoo, Studen, Switzerland, 18 May 1982. I

Siamang (Symphalangus syndactylus)

nfant female "Sasak", 8 months old, Zürich Zoo, Switzerland, 15 Jan. 1993.
This is one of the twins shown in the first photograph of immature siamangs (see above). Only the female twin exhibited patches of light fur above each eye. These are precursors of the light brow band pattern occasionaly occurring in adult siamangs (see above). Infant male "Layang", 8 months old, Zürich Zoo, Switzerland, 3 July 1986.

Siamang (Symphalangus syndactylus)

Infant female "Nias", 10 months old, with her mother "Chandra", Zürich Zoo, Switzerland, 12 Nov. 1987. Infant male "Fadoro", 1 year and 9 months old, Zürich Zoo, Switzerland, 16 March 1981.

Two subadult offspring with their mother "Siam", Berlin Zoo, Germany, 15 May 1998.


Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 22 Aug. 2008.

Adult male "Wim" calling, Zürich Zoo, Switzerland, 1 June 2005.	Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008.	Adult male "Abo" (left) and female "Linda" (right), calling, Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008.

Adult male "Narong", Zürich Zoo, Switzerland, 27 June 1981.	Adult female "Gaspa", Zürich Zoo, Switzerland, 16 March 1981.

Adult male "Festus", Metro Zoo, Miami, U.S.A., 31 July 1988.	Adult female "Hexe", Duisburg Zoo, Germany, 21 June 1988. The whitish brow band in this female is a very rare trait of males and females of this species. Its occurrence suggests that ancestral forms had a white face ring (Geissmann, T., 2003: Circumfacial marking in siamang and evolution of the face ring in the Hylobatidae. Int. J.Primatol. 24: 143-158. Read this paper here).

Adult male "Kajang", Twycross Zoo, U.K., 3 Oct. 1988. This male also exhibits a variant of the light brow band.	Adult female "Püppi II" (left) and her father "Piet" (right), Duisburg Zoo, Germany, 21 June 1987. This female also shows a light brow band like her mother ("Hexe", shown above).

Adult male "Otto", Zoo Doué-la-Fontaine, France, 28 May 1988.	Adult male "Otto", Zoo Hellabrunn, Munich, Germany, 24 July 1982. This male exhibits an acrobatic display which is characteristic for a particular part of the duet song's great call sequence.

Adult female (left) and adult male, Taman Safari Zoo, Cisarua, Java, Indonesia, 20 Sept. 1998. Adult pair during a duet song bout. Notice (incompletely) inflated throat sacs.	Adult pair "Hexe" (left) and "Piet" (right), Duisburg Zoo, Germany, 21 June 1987. Another pair during a duet song bout. The throat sac of the male is fully inflated.


Infant twins (1 male, 1 female), hardly 2 months old, with their mother "Chandra", Zürich Zoo, Switzerland, 30 June 1992.	Infant female "Trine", Duisburg Zoo, Germany, 11 weeks old, Dec. 1974. Phot. Dr. Jesse. This infant not only exhibits the early stages of a light brow band pattern, but also a light corona, which disappeared later during this siamang's life. A photograph of this female as an adult can be found further above.	Infant male (3 months old), Japan Monkey Centre, Inuyama, Japan, 20 Aug. 2008.

Infant male, 5 months old, with his mother "Manga", Hellabrunn Zoo, Munich, Germany, 28 April 1995.

Infant male, 5.5 months old, with his mother "Liseli", Seeteufel Zoo, Studen, Switzerland, 18 May 1982.		I

nfant female "Sasak", 8 months old, Zürich Zoo, Switzerland, 15 Jan. 1993. This is one of the twins shown in the first photograph of immature siamangs (see above). Only the female twin exhibited patches of light fur above each eye. These are precursors of the light brow band pattern occasionaly occurring in adult siamangs (see above).		Infant male "Layang", 8 months old, Zürich Zoo, Switzerland, 3 July 1986.

Infant female "Nias", 10 months old, with her mother "Chandra", Zürich Zoo, Switzerland, 12 Nov. 1987.	Infant male "Fadoro", 1 year and 9 months old, Zürich Zoo, Switzerland, 16 March 1981.

Two subadult offspring with their mother "Siam", Berlin Zoo, Germany, 15 May 1998.

Siamang Symphalangus syndactylus

Adult siamangs

Immature siamangs

Siamang
Symphalangus syndactylus