Nonrandom dispersal drives phenotypic divergence within a bird population.

The across-years repeatability (Lessells and Boag 1987 ) of tarsus length is highly significant in both sexes (males: R = 0.78, females: 0.75, both P < 0.0001).

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Although marginally nonsignificant, most of the (few) adult males that exchanged habitats also moved from CF to DF rather than the reverse (Fig. 4 ).

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