Ranging behaviour and habitat selection of 23 male and 6 female adult (5-10 years old) Alpine chamois Rupicapra rupicapra (Linnaeus 1758) were monitored from February 2000 to December 2002, in an area of the Western Alps. The chamois were radio-located for a minimum of 4 and a maximum of 35 months, until failure of radio transmitters. A mean number of 13 locations/individual/month was recorded for a total of 7902 fixes. Adult males were divided in 19 residents (territorial males, with overlapping or adjacent warm and cold month ranges) and four migrants (with non-overlapping warm and cold month ranges, as well as attending higher altitude areas in the warm months). Home range and core area (kernel 95 and 50%, respectively) sizes of each individual were significantly greater in the warm (June-November) than in the cold (December-May) periods. During the warm period, home range and core area sizes significantly differed between resident (median home range: 49 ha; Q 1 -Q 3 : 31-110 ha) and migrant males (median home range: 749 ha; Q 1 -Q 3 : 539-850 ha), as well as between females (median home range: 711 ha; Q 1 -Q 3 : 388-1842 ha) and resident males. No significant difference was observed in the cold period. Home range size was not correlated to the presence of snow cover (≥ 70%). Throughout the year, nearly all chamois used south-to southeast-facing slopes. Resident males strongly preferred pastures and meadows, but four of them used alder shrublands on the north-east slope more than expected, in the warm months. Females kept nearly always at altitudes greater than those used by resident males and inhabited higher-quality areas.

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