Fig. 2. (A) Percentages of individual moths (sample replicates in parentheses) that approached only (grey bars) or approached and probed (black bars) at seven different spatial manipulations of sensory stimuli in a wind tunnel. Different letters denote significant differences between treatments for the `approach and probing' variable. *Based on the response of one moth. (B) Mean ± confidence interval (=0.05) of time elapsed between take-off and approach to the visual target under different conditions of visual and olfactory cue presentation (see Materials and methods and Table 2 for experimental and statistical details). Asterisk denotes significant differences for the `approach time' variable between the positive control and the treatments in which odor and visual stimuli were spatially separated. Numbers in parentheses are moths that approached the visual target and thus represent a subset of sample sizes given in Fig. 2A.