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Vol. 86 No. 4 (2009)

Published: 2009-12-31

Research articles

Stomach content and grit ingestion by Rook Corvus frugilegus nestlings

G. Orlowski, Z. Ksasprzykowski, Z. Zawada, G. Kopij

117–122
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Diet composition of Common Kestrels Falco tinnunculus and Long-eared Owls Asio otus coexisting in an urban environment

J. Riegert, M. vy, D. Fainov

123–130
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Brandt's Vole density affects nutritional condition of Upland Buzzard Buteo hemilasius on the Mongolian Grassland Steppe

G. Sundev, R. Yosef, O. Birazana

131–139
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Sex-specific parental care by incubating Little Auks (Alle alle)

K. Wojczulanis-Jakubas, D. Jakubas, L. Stempniewicz

140–148
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Brief report

Sperm characteristics of male hybrid from a cross between male Black Grouse Tetrao tetrix and female Capercaillie T. urogallus

A. Ciereszko, A. Kowalczyk, E. Lukaszewicz, A. Krzywinski, A. Kobus, G. J. Dietrich

149–152
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