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Stomach content and grit ingestion by Rook Corvus frugilegus nestlings

Grzegorz Orlowski, Auteur ; Zbigniew Kasprzykowski, Auteur ; Zbigniew Zawada, Auteur ; Grzegorz Kopij, Auteur

Dans Ornis Fennica (86(4) 2009)

Stomach content was examined in 53 out of 56 dead Rook Corvus frugilegus nestlings found in several breeding colonies in Poland. The stomachs contained 29 different types of items, 46.5% of which were animal, 12.2% plant and 41.2% mineral (small[...]

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