Description: English: Aythya baeri, historical range as known is 1925. Date: 28 December 2016. Source: "A natural history of the ducks", vol. 3, 1925
https://www.biodiversitylibrary.org/page/39877691#page/298/mode/1up. Author: Benson, Frank Weston, 1862-1951 or Brooks, Allan, 1869-1946 or Fuertes, Louis Agassiz, 1874-1927 (doesn't say).