Fig. 3
From: Adults have more male-biased sex ratios than first-winter juveniles in wintering duck populations
A comparison of the proportions of males among first-winter juveniles and adults within each species. The error bars represent the binomial 95% CI associated with each proportion, while the grey dashed line indicates parity (i.e. a 0.5 proportion of males). Significant differences between age classes were detected for all species