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Fig. 5. Effect of visual treatment on the length of track flown by birds
(N=12) before passing the 500 m, 1000 m and 1500 m boundaries,
measured from the release site. Dots show, for each bird, differences in the
length of track flown to cross each of the three segments, calculated as track
lengthVIS-track lengthVIS+, and averaged across
the four release sites.
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