Grašyte, Gintare, Saulius Rumbutis, Mindaugas Dagys, Daiva Vaitkuviene, och Rimgaudas Treinys. ”Tawny Owl Females of Intermediate Colour Morph reproduce better and Increase in a Local Polymorphic Population”. Ornis Fennica 94, no. 1 (mars 31, 2017): 33–44. åtkomstdatum november 21, 2024. https://ornisfennica.journal.fi/article/view/133910.