The expression of the dark ventral fur is expressed only moderately in this female.
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This species, like all crested gibbons, exhibits strong sexual dichromatism. Males usually exhibit a brown chest. The occipital crest is relatively small. Females exhibit a broad light face ring and a very large black occipital patch which conects to the black facial area and which extends dorsally down to the shoulder blades. The females usually exhibit a black belly, but the extent of the dark ventral fur is variable. In some females, the dark ventral fur is weekly expressed. Females of N. concolor also exhibit a dark ventral area, whereas females of other species of crested gibbons have a light ventral area.
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| Male, Guangxi province, China, c.2007. Foto: Zhao Chao. | Male, Guangxi province, China, c.2007. Foto: Zhao Chao. | |
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| Adult female, Guangxi province, China, c.2007. Foto:
Zhao Chao. The expression of the dark ventral fur is expressed only moderately in this female. |
Adult female with infant, Guangxi province, China, c.2007. Foto: Zhao Chao. | |
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| Adult female "Patzi" (same individual as on previous photograph), Tierpark Berlin, Germany, 5 Aug. 1985. Phot.: Klaus Rudloff. | Dead adult female "Patzi" (same individual as on previous photograph), Tierpark Berlin, Germany, 9 July 1986. Phot.: Wolfgang Scherf. | |
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| Infant female "Patzi", Tierpark Berlin, Germany, ca. 1962. The female reportedly originated from the hinterland of Hon Gai (Quang Ninh, NE Vietnam) and was bought in Hanoi on 14 Sept. 1961. This photograph was sold as a postcard at the Tierpark Berlin in 1964. Phot.: Gerhard Budich. | Subadult male, mounted specimen LZH 3.101.5 (M149), Zoological Institute, Hanoi University. Collected in Ba Cao (Tam Dao, Vinh Phu province, NE Vietnam) on 13 Jan. 1961. | Subadult male, mounted specimen LZH 3.101.5 (M149), same specimen as on previous photograph. |
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