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The distribution of vervets in Barbados was not uniform across the island, vervets being more abundant in parishes with high vegetative cover and low human population density. Ranging patterns for 4 troops of vervets in Barbados were shown to be influenced by the maximum daily temperature and the mean daily humidity. The frequency of use of an area decreased with increasing distance from the sleeping site, and the duration of use increased with increasing distance from the sleeping site. An interpopulation comparison of home range size and ranging patterns of vervet populations from Africa and St. Kitts, showed a positive correlation between home range size and group size and a negative correlation between home range size and population density. / The genetic structure of the Barbados population was characterized by relatively high levels of heterozygosity and gene diversity at the group level, and small genetic distances between groups indicating adequate gene flow between groups. Three of the 6 polymorphic loci investigated showed differences in allele frequency between east and west sub-populations of vervets, indicating some genetic differentiation.