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. 2009 Nov 4;7(Suppl 2):S227–S233. doi: 10.1098/rsif.2009.0376.focus

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© 2009 The Royal Society

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Figure 3. — Garden warblers wearing hoods can use their magnetic compass if light and/or visual input reaches any one eye. (a,b) The results from birds equipped with hoods with an 8 mm diameter hole in front of both eyes. (c,d) The results from birds equipped with hoods allowing light and visual input to reach only the left eye. (e,f) The results from birds equipped with hoods allowing light and visual input to reach only the right eye. The data in (a,c,e) were collected in an unchanged magnetic field (NMF). The data in (b,d,f) were collected in a magnetic field turned 120° counterclockwise (CMF). mN, magnetic North. For a description of the circular diagrams, see the legend to figure 2.