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Article
J. Sorjonen, AuteurAccording to old Finnish ornithological literature, two different rain-call dialects of the Chaffinch existed in eastern Finland at the end of the 19th century and the beginning of the 20th century. In this work I studied the current existence a[...]
Article
J. Sorjonen, Auteur ; J. Merilä, AuteurMale bluethroats (Luscinia svecica) have a complex song which is often delivered in the form of song flights. Earlier studies, based upon timing of display, indicate that the chief function of the bluethroat's song was for mate attraction/retent[...]
