POLAK, M. Booming activity of male Bitterns Botaurus stellaris in relation to reproductive cycle and harem size. Ornis Fennica, [S. l.], v. 83, n. 1, p. 27–33, 2006. Disponível em: https://ornisfennica.journal.fi/article/view/133651. Acesso em: 22 nov. 2024.