Red Crossbill Loxia curvirostra
Call types of the North American and Western Palearctic populations.
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Evening Grosbeak Coccothraustes vespertinus
Validity of call types and potential full-species separations for flight call types.
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Redpoll complex
Arbiters of visual identification of redpolls species based on photos for this worldwide cryptic species complex.
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Hawfinch Coccothraustes coccothraustes
Call types of the Palearctic populations.
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Eurasian Bullfinch Pyrrhula pyrrhula
Call types and taxonomic status of the Palearctic populations.
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Common Rosefinch Carpodacus erythrinus
Function of the two different song types.
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