Summary
A critical analysis of published information concerning the Ferruginous duck Aythya nyroca (Güldenstädt, 1770) in Upper Amur (Amur Region, Far East Russia) concluded that all birds ever been mentioned here in publications as Ferruginous ducks, were actually Baer’s Pochards Aythya baeri.
Full-text publisher’s translation into English available: Appendix, pp. 9—12