FULLAGAR, P J; DAVEY, C C; RUSHTON, D K. Social behaviour of the Freckled Duck Stictonetta naevosa with particular reference to the axle-grind. Wildfowl, [S. l.], p. 53–61, 1990. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154047. Acesso em: 17 dec. 2025.