Figure 2

Left column: Mean visual pigment λmax for P. e. elegans and P. e. flaveolus for each visual pigment type. Error bars represent ± 1 standard error. Significant results are indicated by a black line and asterisk. Right column: Spread of all individual photoreceptor cell λmax for each individual bird, grouped by subspecies: Individuals 1–7: P. e. elegans; Individuals 8–12: P. e. flaveolus. Rows: a: LWS; b: MWS; c: SWS; d: UVS; e: Rod.