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Selection of physical habitat variables by desert bighorn sheep Ovis canadensis weemsi in the Sierra del Mechudo, Baja California Sur is analysed. Seasonal differences among sex and age classes were found. Sheep are mainly in mountain slopes and canyon slopes ( > 80%) with SE and N orientation, changing along the day and season. The elevation is 100-400 m a.s.l. and the distance to escape terrain < 200 m. Segregation of rams occurs outside the rut, with ram selecting different habitat variables during lambing, winter and spring. The prefered waterholes are near escape terrain with poor vegetal cover and good visibility. (C) 2001 Academic Press.