B. anynana is both phenotypically plastic and sexually dimorphic for eye size. (a) Dry season female. (b) Dry season male. (c) Wet season female. (d) Wet season male. (e) Absolute mean eye size for each sex and seasonal form. (f) Relative mean eye size (corrected for body size) for each sex and seasonal form, using forewing area as a covariate, and evaluated at a wing area of 164.20 mm2. Error bars indicate 95% CI of means. Scale bar applies to all images in a-d.