. Bonner zoologische Monographien. Zoology. 259. : Historical distribution of Papio hamadryas, Papio anubis and Cercopithecus aethiops aethiops in northern Ethiopia and Eritrea (Yalden et al. 1977). home-range of the group. Similarly, grivet sites were provided with a km radius buffer. These home-range sizes correspond with data from other baboon and grivet studies (Cheney 1987). We included the geographical position of primate sites and information on the vegetation in a subsequent GIS analysis and mapping. Primate habitats were then described by their ecological parameters. We compa
. Bonner zoologische Monographien. Zoology. 259. : Historical distribution of Papio hamadryas, Papio anubis and Cercopithecus aethiops aethiops in northern Ethiopia and Eritrea (Yalden et al. 1977). home-range of the group. Similarly, grivet sites were provided with a km radius buffer. These home-range sizes correspond with data from other baboon and grivet studies (Cheney 1987). We included the geographical position of primate sites and information on the vegetation in a subsequent GIS analysis and mapping. Primate habitats were then described by their ecological parameters. We compared the habitats of the three species and primate habitats in the five different eco-zones. Results We found 78 sleeping cliffs of Papio hamadryas at all altitudes of all ecological zones, from the coastal area to the western lowland (fig. 1). In 49 cases, we were able to estimate the number of individuals that congregate at the sleeping cliff. In the south-western part of the western lowlands, Olive baboons replace Hamadryas baboons. Here we encountered 8 small groups of Olive baboons (6-28 individuals). We detected Grivet monkeys at 43 different sites in all ecological zones except the coastal lowlands (). Hamadryas and Olive baboons have exclusive ranges, whereas Grivet monkeys are sympatric with both baboon species. Overall, the current distribution of Papio hamadryas and Papio anubis seems not to deviate from their historical distribution as reported by Yalden et al. (1977) (). The precipitation and elevation data of primate home-ranges in Eritrea are given in table 1. Hamadryas baboons live in areas with less than 200 mm up to 1000 mm Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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