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Radiotracking of three couples of polecats Mustela putorius Linnaeus, 1758 in wetlands of western France showed that the monthly home ranges of male averaged 0.426 km2 and overlapped the females' ranges which were smaller (0.125 km). Although the distribution of polecat's localizations in the three main habitats differed significantly between the male and the female, the seasonal overlap of habitat niches (C jk) was considerable and varied from 0.727 to 0.894. The proportion of simultaneous localizations on the same square averaged 4% of monthly localizations while 96% of localizations indicated solitary activity. Also, the duration of time occuring together was short: only 1.8 days per month on average.