S. S3, . Changing, . Strength, and . Starvation-risk-figure, S3-1-Relationship between mean time spent vigilant accross patches (%, median, lower and upper quartile) and group size for solitary individuals (blue), group leaders (green) and followers (red), in situations where the likelihood of meeting the predator is four (left), eight (middle) or sixteen (right) times higher in the risky than in the safe patch and starvation risk is either high

, %, median, lower and upper quartile) and group size for solitary individuals (blue) and group leaders (green), in situations where the likelihood of meeting the predator is four (left), eight (middle) or sixteen (right) times higher in the risky than in the safe patch and starvation risk is either high, CHAPITRE 1. SPACE USE, LEADERSHIP AND VIGILANCE Figure S3-2-Relationship between time spent in the risky patch

, group leaders (green) and followers (red), in situations where the likelihood of meeting the predator is four (left), eight (middle) or sixteen (right) times higher in the risky than in the safe patch and starvation risk is either high, Figure S3-3-Relationship between mean nutritional state (%, median, lower and upper quartile) and group size for solitary individuals (blue)

, lower and upper quartile) and group size for solitary individuals (blue), group leaders (green) and followers (red), in situations where the likelihood of meeting the predator is four (left), eight (middle) or sixteen (right) times higher in the risky than in the safe patch and starvation risk is either high, CHAPITRE 1. SPACE USE, LEADERSHIP AND VIGILANCE Figure S3-4-Relationship between standard deviation of nutritional state (%, median

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