Fig. 2. Orientation of worker bees in the wind tunnel according to the odorous stimulation: nestmates' odour, linalool and no odour (control group). (A) Mean duration ± S.D. of the total flight and of the flight around the odour source. (B) Percentages of bees exhibiting orientated flights (upwind zigzag flight) and circling behaviour. Asterisks indicate significant differences: P<0.05; NS, not significant.