Hybridization in the wild between broadly sympatric species has been reported for 13 species of African primates. Three guenons, believed to be Sykes's monkey Cercopithecus mitis × vervet monkey Chlorocebus pygerythrus hybrids, are reported here; two at Diani on the south coast of Kenya and one at Ngong Forest Sanctuary, Nairobi. These are the first records of hybridization between these broadly sympatric species, as well as between these genera. Most of the phenotypic characters of these hybrids are intermediate between the parent species. This paper (1) describes these hybrids and the environments in which they live; (2) briefly reviews hybridization among Africa's primates; (3) describes scent-marking behavior by one of the hybrids; (4) briefly reviews scent-marking among Africa's monkeys; (5) discusses the environmental circumstances that may weaken genetic barriers and facilitate hybridization; and (6) suggests topics for research on the ecology, behavior, and evolutionary significance of these three hybrids.
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