Rosenberger, Joanna, Ewa Lukaszewicz, Artur Kowalczyk, and Zenon Rzonca. “Capercaillie (Tetrao Urogallus) Eggshell Pigmentation, Maculation and Thickness”. Ornis Fennica 95, no. 4 (December 31, 2018): 160–170. Accessed May 18, 2024. https://ornisfennica.journal.fi/article/view/133939.