Fig. 3

Principal component analysis (PCA) of the variation in shape between sexes, where 1 = males and 2 = females. a PCA of the mandible with 49.9 % of the variation explained by the first axis and 12.7 % by the second. b PCA of the ventral view of the cranium with 30.3 % of the variation explained by the first axis and 12.6 % by the second