Kilpi, M., and P. Byholm. “The Odd Colour of the Last Laid Egg in Herring Gull Larus Argentatus Clutches: Does It Reflect Egg Quality?”. Ornis Fennica 72, no. 2 (July 1, 1995): 85–88. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133418.