SASKATCHEWAN NATURAL HISTORY SOCIETY. Fifth Annual May Day Count, Saskatoon. Blue Jay, [S. l.], v. 19, n. 3, 1961. DOI: 10.29173/bluejay2489. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2489. Acesso em: 13 dec. 2025.