(Downloading may take up to 30 seconds. If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.
Fig. 3. Orientation behaviour of robins in autumn. C, control experiments under
`white' light; G, normal tests under green light; RpeR, birds pre-exposed to
red light tested under red light. Symbols as in
Fig. 1.
