Black crested gibbon
Nomascus concolor

This species, like all crested gibbons, exhibits strong sexual dichromatism. 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. nasutus also exhibit a dark ventral area, whereas females of other species of crested gibbons have a light ventral area.

Adult male, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Adult male "Dong-Dong" (with female "Hong-Hong" in the background), Gejiu Zoo, China, 3 Sept. 1990. Apart from a few white hairs in the corner of the mouth, the male is completely black.
Adult female "FB" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Adult female "FB" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Adult female "FB" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.
Adult female "FB" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Adult female "FB" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Adult female "FY" with infant, Wuliang mountains, China, c.2003. Photo: Fan Pengfei. This female has almost no dark ventral fur.
Adult female "Hong-Hong", Gejiu Zoo, China, 3 Sept. 1990.	Adult female "Hong-Hong", Gejiu Zoo, China, 3 Sept. 1990.

Immature gibbons

Juvenile, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.	Juvenile, Wuliang mountains, China, c.2003. Photo: Fan Pengfei.