Faecal analysis was used to investigate the relative contribution of arthropods and fruit to the premigratory diet of the Redstart and 4 European Sylvia warblers in Senegal in March. The warblers showed greater premigratory fattening and higher fruit consumption than the Redstart. Berries of the shrub Salvadora persica¸ were exploited by all species with berries over 5 mm diameter being selected.
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Stoate et al. (1995) studied this question.
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