Alpine ibex within the Belledonne population migrate from steep south-facing rocky cliffs in low-altitude winter ranges (~1,860 m) to high-altitude alpine pastures for summer ranges (~2,360 m). The ibex use steep south-facing snow-free corridors distributed 50 km along the Belledonne massif and generally avoid crossing roads, even to access other mountain ranges on the opposite side (Oisans and Arvan-Villards mountain ranges). In spring, migratory individuals jump the green wave of vegetation as it progresses up in elevation with snowmelt, arriving just before vegetation reaches peak maturity