HAFTORN, S. Flock formation, flock size and flock persistence in the Willow Tit Parus montanus. Ornis Fennica, [S. l.], v. 76, n. 2, p. 49–63, 1999. Disponível em: https://ornisfennica.journal.fi/article/view/133498. Acesso em: 17 touko. 2024.