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Vol. 68 No. 1 (1991)

Published: 1991-03-31

Research articles

Morphological variation in sympatric and allopatric populations of European Willow Warblers and Chiffchaffs

I. K. Hanski, J. Tiainen

1–16
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Food choice and feeding by male and female Common Treecreepers (Certhia familiaris) during the nestling period

J. Suhonen, M. Kuitunen

17–25
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The shore-and waterbirds on some grazed and ungrazed islands on the Finnish west coast

J. Ulfvens

26–32
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Brief report

Frederick II of Hohenstaufen, Bergmann`s rule and Aristotelian typology

P. Niemelä, J. Salo, H. Laaksonen

33–35
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