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In a context of increasing concern for biodiversity conservation but decreasing resources devoted to species management, measuring the impact of actions is critically needed so as to optimise conservation practices. Long-term longitudinal data collected on marked individuals allow for an assessment of the demographic response of a population to conservation actions while accounting for potential confounding factors. This study focused on the recovery of a geographically-isolated population of the endangered Egyptian vulture in south-eastern France, which experienced food shortages induced by major changes in habitat and sanitary legislation limiting the abandonment of dead animals in the field. The survival rates and population dynamics of the Egyptian vulture were computed, following the implementation of supplementary feeding stations, while accounting for the potential variation in environmental …