Distribution of chimpanzees and interactions with humans in Guinea-Bissau and western Guinea, West Africa.

To clarify the distribution and the status of chimpanzees in Guinea-Bissau and on the border with Guinea, we conducted an interview survey with hunters in 110 and 60 villages in Guinea-Bissau and Guinea, respectively. Based on the results of the survey, the northern distribution limit of chimpanzees in Guinea-Bissau appears to be located between the Corubal river (which once was suspected to represent the distribution limit) and the Gabù-Bafata road. Chimpanzees were reported to be common in most of the surveyed area and are not a game species. Crop-raiding by chimpanzees was mentioned by most interviewees. The implementation of a land management system that maintains a mosaic of habitats is the priority for the long-term conservation of this cross-border population.