Szukana fraza: [Abstract = "Magpies were most often encountered as single birds in April and May, as pairs in March, and in flocks in August. This pattern is predominantly dictated by the constraints of the breeding season and by reproductive success. The mean flock size was highest in August. Pecking rate showed a minimum in the summer months, with no sex\-specific difference. However, males were much more active in foraging during winter, probably due to their larger body size and the respective higher energetic requirements."]

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