39th suppl. : Redpoll Acanthis flammea American Ornithologists' Union 4th edition incl. 18th suppl. : Common Redpoll Carduelis flammea American Ornithologists' Union 7th edition incl. 3: Common Redpoll Acanthis flammea IOC World Bird Names, version 8. 55th suppl. 7: Common Redpoll Carduelis flammea IOC World Bird Names, version 2. 5 incl. 6: Common Redpoll Carduelis flammea IOC World Bird Names, version 1. Irruptive species that moves south in numbers only some years.