MATTHEWS, G V T. ’Nonsense’ orientation in Mallard; a resum and an investigation of the mechanism of a sun-compass. Wildfowl, [S. l.], v. 35, p. 81–92, 1984. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155391. Acesso em: 17 dec. 2025.