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Fig. 7. Representative polar scatter plot of landing positions (owl Q). (A) The
center of the plots corresponds to the target speaker position. The landing
positions of trials with a correction turn (triangles) or without a correction
turn (black dots) are plotted clockwise from 0 to 359 deg. in a circular
diagram. The central gray circle indicates the `hit' area of a 20 cm radius
around the centre of the target speaker. The maximum landing distance was 128
cm (see gray line and number). Gray and black dots outside the circle indicate
the landings in a particular quadrant. (B-E) The landing positions of the
three owls were analyzed for trials without (B,D) or with a correction turn
(C,E) for the distribution of their angles [
(degrees); B,C] and
distances [
(cm); D,E]. The positions were divided into bins of 30 deg.
() or 10 cm () and plotted into histograms. In trials without
correction turn the distribution of angles is double-peaked between 75 and 135
deg. and between 195 and 255 deg. (B). The distances exhibit one peak at
distances between 35 and 115 cm (D). In trials with a correction turn, the
distribution of angles is less bifurcated than in trials without a correction
turn (C). Distances are distributed around values between 5 and 35 cm (E).
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