Väänänen, Veli-Matti, Hannu Pöysä, and Pentti Runko. “Nest and Brood Stage Association Between Ducks and Small Colonial Gulls in Boreal Wetlands”. Ornis Fennica 93, no. 1 (March 31, 2016): 47–54. Accessed November 21, 2024. https://ornisfennica.journal.fi/article/view/133887.