Descriptive statistics for family and bachelor group size at the study locations, pooled across the years of study.

Predation-risk level (PR), population density range expressed as guanacos.km−2 (Density), sample sizes (N), mean group sizes and standard deviations (SD), range of observed group sizes (Range), coefficient of variation (%CV), kurtosis (standard error of kurtosis) and skewness (standard error of skewness).