SCHUMMER, Michael A. et al. Aggression and behavioural dominance in wintering Mallard Anas platyrhynchos and American Black Duck A. rubripes. Wildfowl, [S. l.], p. 167–178, 2020. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154563. Acesso em: 16 dec. 2025.