Fig. 4. The effect of the inclination of the flight path on the body orientation of a flying bee. The black-and-white squares depict the checkerboard pattern in the (A) horizontal, (B) vertical and (C) oblique tunnels. In each case, the drawing of the bee illustrates the mean body orientation of (A) 19°, (B) 10° and (C) –3°. Arrows indicate the direction of flight. Histograms show the number of flights representing each angle of body orientation, binned in 5° intervals, as measured in the (D) horizontal, (E) vertical and (F) oblique tunnels.