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Brunton, D.H., Evans, B., Cope, T. and Ji, W. (2008). A test of the dear enemy hypothesis in female New Zealand bellbirds (Anthornis melanura): female neighbors as threats. Behavioral Ecology, 19 (4): 791-798. DOI: 10.1093/beheco/arn027 [1]Archived 2013-06-17 at archive.today
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Moser-Purdy, C; MacDougall-Shackleton, E; Mennill, D. J. (2017). "Enemies are not always dear: male song sparrows adjust dear enemy effect expression in response to female fertility". Animal Behaviour. 126: 17–22. doi:10.1016/j.anbehav.2017.01.009. S2CID53273443.