Abstract
Wing size and shape variation in thirteen species of Old World leaf warblers, genus Phylloscopus, were examined using wing formulae and principal components analysis. Data were taken from male individuals in breeding populations in Northern India and Japan. Species with longer wings migrate further and hover less than species with shorter wings. Species with more pointed wings migrate further and are more arboreal than species with rounder wings. Findings agree with those from previous studies on the genus Phylloscopus. Both foraging behaviour and migration distance have affected wing size and shape evolution in the genus.
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