As far as we know, there are no data on how changes in the freshwater fauna within the same area affect the feeding preference of the Grey Heron Ardea cinerea . We present data on the diet of the bird during the breeding seasons of 1990 and 1991 in central‐west Spain and compare these data with those obtained from the same colonies in 1986–1987.
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Peris et al. (1994) studied this question.
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