English: Painting of three species of teals (small ducks) from genus Anas: the Common Teal (Anas crecca, left), the Garganey Teal (Anas querquedula, up in the middle), and the Falcated Teal (Anas falcata, right).
Źródło
This image comes from the book:
Naumann, Naturgeschichte der Vögel Mitteleuropas. 3. Aufl. Neubearb. von G. Berg et al. Hrsg. von Carl R. Hennicke. (Naumann, Natural history of the birds of central Europe, 3rd Ed. Revised by G. Berg et al.; Edited by Carl R. Hennicke.) of 1905 or his earlier works.
Ten materiał przeszedł do domeny publicznej w kraju pochodzenia, jak również w państwach i terytoriach, gdzie prawo autorskie wygasa w ciągu 100 lat po śmierci autora.
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse Originally uploaded to pl.wikipedia.org by Radomil on Aug 18, 2004
''Anas crecca'' (left), ''Anas querquedula'' (up in the middle) and ''Anas falcata''' (right); from http://www.biologie.uni-hamburg.de/b-online/birds/1615_32.htm, originally uploaded to pl.wikipedia.org by Radomil on Aug 18, 2004
