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Wood, Kevin A.; Ham, Phoebe; Scales, Jake; Wyeth, Eleanor; Rose, Paul E. (). „Aggressive behavioural interactions between swans (Cygnus spp.) and other waterbirds during winter: a webcam-based study”. Avian Research. 11 (1): 30. doi:10.1186/s40657-020-00216-7. ISSN2053-7166.