ROERIG, J. Shadow boxing by birds - a literature study and new data from southern Africa. Biodiversity Observations, [S. l.], p. 39–68, 2013. DOI: 10.15641/bo.190. Disponível em: https://journals.uct.ac.za/index.php/BO/article/view/190. Acesso em: 24 nov. 2025.