Wild chimpanzees, Pan troglodytes, show regional differences in feeding [Boesch and Boesch-Achermann, 2000], tool using [McGrew, 1992], grooming [Nakamura et al., 2000], courtship [Nishida et al., 1999] and vocal communication [Mitani et al., 1992]. Comparisons have revealed at least 39 behavioural differences among chimpanzee populations [Whiten et al., 1999]. Here we add to that list by reporting new observations of locale-specific grooming patterns in two groups of wild chimpanzees.