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The locomotor behaviour of 2 groups of Propithecus verreauxi (Verreaux's sifaka) was studied over an 8-month period in Kirindy Mitea National Park (KMNP), Madagascar. This paper assesses the major characteristics of their locomotion, focusing on the extent that seasonal variation in climate and habitat, and local variation in habitat, is reflected in changes in locomotor behaviour. P. verreauxi is a committed leaper with a strong preference for vertical and angled supports. We found clear between-group differences in support orientation and diameter suggesting local variation in habitat. During the dry season, P. verreauxi utilizes smaller-diameter supports than in the rainy season. While this difference cannot yet be ascribed to any single cause, we discuss the factors which may contribute to this result., (© 2015 S. Karger AG, Basel.)