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. 2009 Mar 18;276(1665):2153–2162. doi: 10.1098/rspb.2009.0016

Figure 1.

Figure 1

Occurrence of the first crow (open circles) and the first segmented crow (filled circles) during the experiment. Transfer from 12 L : 12 D to 14 L : 10 D was done on day 49. Note that quail no. 6 did not produce segmented crows during the experiment.