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Fig. 6. Comparison between the mean vectors and their 95% confidence limits of
pigeons with different experience and treatment. The diagrams of the upper row
(N-S, No-Shift) and the lower row (C-S, Clock-Shift) refer to the orientation
of pigeons released without or after clock-shift treatment, respectively.
White sectors correspond to pigeons unfamiliar with the release site; grey and
black sectors correspond to pigeons familiar with the release site, intact and
anosmic, respectively.