Host: Acanthis flammea (Common Redpoll)
Host: Acanthis hornemanni (Hoary Redpoll)
Host: Carduelis carduelis (European Goldfinch)
Host: Coccothraustes vespertinus (Evening Grosbeak)
Host: Haemorhous cassinii (Cassin's Finch)
Host: Haemorhous mexicanus (House Finch)
Host: Haemorhous purpureus (Purple Finch)
Host: Loxia curvirostra (Red Crossbill)
Host: Pinicola enucleator (Pine Grosbeak)
Host: Spinus pinus (Pine Siskin)
Host: Spinus tristis (American Goldfinch)