Evening Grosbeak (Hesperiphona vespertina) Science Article 3
abstract
Once one of the most common species seen at bird feeding stations across much of North America in winter, the Evening Grosbeak (Coccothraustes vespertinus), appears to be experiencing a population decline. Like other finches associatedwith the boreal forest or high elevations, Evening Grosbeaks form flocks in winter, often irrupting out of their breeding range and frequenting supplemental feeding stations where populations may be monitored.
David N. Bonter and Michael G. Harvey, The Condor 110(2):376-381