Principal components one and two of A female and B male bees where symbols indicate family (Apidae: circles, Colletidae: triangles, Halictidae: squares, Megachilidae: crosses and Stenotritidae crossed-squares) and colour indicates known foraging behaviour (diurnal: red, facultative low-light: green and obligate low-light: blue). Measurements are defined in Fig. 1. Plots A and B indicate relative factor loadings for the morphological traits as vectors from the centroid. Discriminant scores for both C female and D male analyses for each behavioural group showing means and 95% confidence intervals.