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Vol. 64 No. 4 (1987)

Published: 1987-12-31

Editorial

Statistical methods used in Ornis Fennica

A. Järvinen

159–160
- pdf

Research articles

Seasonel and geographical variation in the clutch size of the Common Treecreeper Certhia familiaris

M. Kuitunen

125–136
- pdf
Migration routes and wintering areas of Willow Warblers Phylloscopus trochilus (L.) ringed in Fennoscandia

A. Hedenström, J. Pettersson

137–143
- pdf
A case of bigyny in the Hawk Owl Surnia ulula: spacing of nests and allocation of male feeding effort

G. A. Sonerud, J. O. Nybo, P. E. Fjeld, C. Knoff

144–148
- pdf
Diets of the Tengmalm´s Owl Aegolius funereus and the Ural Owl Strix uralensis in Central Finland

K. Jäderholm

149–153
- pdf
Status of Caspian Terns Sterna caspia in the Baltic

M. Hario, T. Kastepõld, M. Kilpimaa, R. Staav, T. Stjernberg

154–157
- pdf

Brief report

A successful mixed breeding between Parus cinctus and Parus montanus in Finnish Lapland

A. Järvinen

158–159
- pdf

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