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Fig. 1. Orientation distributions of pigeons released in the unshifted condition at
the three experimental sites. C, control (intact) pigeons; A, anosmic pigeons.
The inner diagrams (open circles) indicate the orientation of the pigeons
while exiting from the circular arena; the outer diagrams (black circles) show
the orientation at vanishing. Each symbol within a diagram represents a single
pigeon. Inner arrows represent the distributions' mean vectors; white and
black arrows are relative to arena and vanishing distributions respectively.
The vector length can be read using the scale in the first diagram. The outer
grey arrows indicate the home directions (H). Other details are reported in
Tables 1 and
2.
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