Tjørve, Kathleen, and Even Tjørve. “Food of Eurasian Oystercatcher (Haematopus Ostralegus) Chicks Raised on Rocky Shores in Southern Norway”. Ornis Norvegica 33 (January 1, 2010): 56-62. Accessed August 11, 2020. https://boap.uib.no/index.php/ornis/article/view/146.