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Article
Michael R. Lawn, AuteurObservations of two mixed-singing Willow Warblers Phylloscopus trochilus in Surrey indicated that both birds were interspecifically territorial with Common Chiffchaffs P. collybita, whereas normal Willow Warblers were not obviously so. One of th[...]
Article
Michael R. Lawn, AuteurThe timing of migration is thought to have a genetic basis, and it might be expected that the arrival dates of individuals would be similar from year to year. However, there are many other factors which influence timing, and significant consiste[...]
