Studies on Pan in the seventies and eighties emphasised discontinuity between the two species, contrasting the male-dominated, aggressive nature of the chimpanzee to the female-oriented, peaceful nature of the bonobo. The hoots were like chimpanzee pant-hoots with an introduction, build-up and climax in a higher pitched bonobo tone and more ‘e’ than ‘o’ sounds. The individuals lip-smacked while grooming and performed swaggering displays. There was one female coalition against the males. We observed mostly female oriented interactions, including grooming, play, approaches and intersexual ventro-dorsal sex. The behaviours could be categorized less exclusively. In each individual, there were anatomical features reminiscent of both of the parental species: the specific bonobo-like pink coloration of the lips, the hairstyle and slender body build, the chimpanzee-like dorsal position of the female genitals, more sturdy body build and prognathism. There was clear individual variation in degree of expression of typical chimpanzee or bonobo features.
We briefly (6.5 h) observed and filmed a small group of four bonobo-chimpanzee hybrids (2 males, aged 10 and 9, and 2 females aged 10 and 8). There is, however, evidence for interbreeding between bonobos and chimpanzees in captivity. There are no accounts of hybridisation under natural conditions. (2004) state the following: “From historical accounts it appears that natural populations of bonobos and chimpanzees have been allopatric since their The most reliable report of bonobo-chimpanzee hybrids appears in a brief abstract of a presentation given at the Spring 2003 meeting of the Primate Society of Great Britain. Obviously, however, a more thorough survey of the forests adjacent to this contact point might turn up something that Fenart and Deblock missed. 11) note that there is one point there where it is possible to cross by jumping from rock to rock at low water, but that a search of that area revealed no evidence of naturally occurring bonobo-chimpanzee hybrids. So relatively little opportunity for contact and hybridization exists.īut bonobos and chimpanzees may, at least on rare occasion, meet upstream of Boyoma Falls (formerly known as Stanley Falls) where the river can easily be crossed, even by humans, during times of low water. Moreover, the two rivers in question are crocodile infested. Untrained apes cannot swim and are afraid of water. The ranges of these two apes are separated by the Congo and the Lualaba rivers. By 2000, the oldest was working in the circus act in place of his retired father.Īpparently, natural bonobo-chimpanzee hybrids have not as yet been reported. Between 19, seven bonobo-chimpanzee hybrids were produced from these matings, most or all of which survived. This male ape, however, turned out to be a bonobo. It performed in acts and regularly mated with two female chimpanzees. In 1979, a circus director in France bought what he believed to be a male chimpanzee. Hybridization between chimpanzees ( Pan troglodytes) and bonobos, also known as pygmy chimpanzees, ( Pan paniscus) has occurred in captivity ( Vervaecke and van Elsacker 1992, Vervaecke 2002 Vervaecke et al.
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