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Differences in the calls of European and North American black-billed magpies and the yellow-billed magpie

Enggist-Dublin, P. & Birkhead, T.R. (1992). Differences in the calls of European and North American black-billed magpies and the yellow-billed magpie. Bioacoustics, Volume 4 (3): 185 -194

 

Abstract: 

We compared several features of the chatter call of two races of black-billed magpies, the nominate, European race Pica pica pica and the North American race P. p. hudsonia and the yellow-billed magpie P. nuttalli. The chatter calls of the two North American species were much more similar to each other than either was to the European magpie. This information together with the recently determined similarities in the behaviour and social organisation of the two North American species, suggests that the phylogenetic affinities of these two species are closer than is implied by their taxonomic status.

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