The Arctic redpoll is similar in appearance to the common redpoll but generally paler. In winter, the gorges are visited by birds such as siskin, redpoll and pochard. Uncommon winter visitors have included pine siskins, common redpoll, and evening grosbeak. Many taxonomic authorities consider the lesser redpoll a subspecies of the common redpoll. Siskin, redpoll and crossbills are recorded on the woodland edge of the reserve. The common redpoll was previously placed in the genus "Carduelis". The common redpoll builds its nest low down in a tree or bush. The common redpoll ("Acanthis flammea") is a species of bird in the finch family. The lesser redpoll ("Acanthis cabaret") is a small passerine bird in the finch family, Fringillidae. The alders attract flocks of siskin ("Carduelis spinus") and redpoll ("C. flammea").