So unique are these songs that they resemble a rainforest bird's calls and bear no similarity to any other non-gibbon primate's vocalizations. Gibbons are also adept, however, at walking upright, both on the ground and in the trees. Silk, Joan B. In addition to vocalizations, black crested gibbons communicate through physical interactions and facial expressions. Thus, group and territory size would be limited. Though the research is not explicit, there can be some assumptions made about altruism within groups. Males are all black with black hairless faces while females are yellowish-beige with black hairless faces and black patches on the top of their head, chest and abdomen.  Other observations have been made that males will share child carrying to place less of a burden on the female, delaying her interbirth time. The Hainan black-crested gibbon or Hainan gibbon (Nomascus hainanus), is a species of gibbon found only on Hainan Island, China.  Yet, upon tolerance by the mother, adult female offspring may remain in the group, as the group continues to forage and feed as family members. The mutual tolerance of females is likely to be caused by "weak territoriality of females".  Social behaviors within groups will evolve according to Hamilton's rule.. A mating system in which a male and female mate exclusively with each other. 211-239. A single young is born every two to three years and the infant is usually weaned once it reaches two years old; Black crested gibbons feed preferentially on ripe, sugar-rich fruit, such as figs, but occasionally consume vitamin-rich leaf buds, and rarely eat animals. Male fitness would benefit from inseminating other females during a birth interval. A frugivore, the black crested gibbon prefers sugar-rich fruits such as figs, but she will forage for leaves, flowers, insects, eggs, and other small organisms when the supply of her first-choice foods becomes scarce, especially during the dry season. Males and females perform haunting duets, often at dawn and initiated from a tall tree on a high hill, in which the male grunts, squeals, and whistles, while the female sings out in rising notes and twitters. Whether performed alone or in pairs, these elaborate songs are thought to play an essential role in defending territories, protecting food resources, mating, and strengthening bonds between pairs and within a family. Like other apes, gibbons do not have tails. Black crested gibbons are excellent acrobatic athletes, with ultra-light frames that enable them to seemingly fly through the canopy and forage for fruit even on the thinnest of branches. western black crested gibbon in Lao PDR extends into the Nam Ha National Protected Area in at least three loca- tions, c . Similarly, Lao PDR has established two protected areas, Nam Ha National Biodiversity Conservation Area and Nam Kan National Biodiversity Conservation Area; officials have also established steep fines and gun control measures to discourage opportunistic hunting. 2006. © 2017-2020 New England Primate Conservancy. Black crested gibbons are excellent acrobatic athletes, with ultra-light frames that enable them to seemingly fly through the canopy and forage for fruit even on the thinnest of branches. Like other apes, gibbons do not have tails. The Case of the Disappearing Habitat: The Candy Culprit-Get Started!  Upon the discovery of single male, multi-female living groups, the question arose to determine if all females were mating. Black crested gibbons are listed on Appendix I of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), making all commercial trade of this species illegal. Lao PDR is globally significant in terms of gibbon conservation, particularly four species of crested gibbon: Western Black Crested Gibbon ( Nomascus concolor) ; Northern White-cheeked Gibbon ( N. leucogenys) ; Southern White-cheeked Gibbon ( N. siki); and. Kin recognition is thought to be favored for maternal-offspring relationships. Researchers have studied the songs of black crested gibbons to understand how the songs can help identify differences between sexes, as well as between other crested gibbon species.
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