Hario, M., and E. Rudbäck. “Dying in the Midst of Plenty — the Third-Chick Fate in Nominate Lesser Black-Backed Gulls Larus F. Fuscus”. Ornis Fennica 76, no. 2 (July 1, 1999): 71–77. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133500.