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Randler, Christoph. Is tail wagging in white wagtails, Motacilla alba, an honest signal of vigilance?. Animal Behaviour. 2006, 71 (5): 1089–1093. S2CID 53189368. doi:10.1016/j.anbehav.2005.07.026.
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Davies, N.B. Food, Flocking and Territorial Behaviour of the Pied Wagtail (Motacilla alba yarrellii Gould) in Winter. The Journal of Animal Ecology. 1976, 45 (1): 235–253. Bibcode:1976JAnEc..45..235D. JSTOR 3777. doi:10.2307/3777.
Davies, N.B. Food, Flocking and Territorial Behaviour of the Pied Wagtail (Motacilla alba yarrellii Gould) in Winter. The Journal of Animal Ecology. 1976, 45 (1): 235–253. Bibcode:1976JAnEc..45..235D. JSTOR 3777. doi:10.2307/3777.
Randler, Christoph. Is tail wagging in white wagtails, Motacilla alba, an honest signal of vigilance?. Animal Behaviour. 2006, 71 (5): 1089–1093. S2CID 53189368. doi:10.1016/j.anbehav.2005.07.026.