IN a wood running along the top of a hill in Surrey which I visited on June 24th, 1936, I heard a Chiffchaff (Phylloscopus collybita) singing in a tall conifer, and as soon as he stopped a Grasshopper-Warbler (Locustella ncevia) started to reel in the undergrowth below him and for several minutes the two birds sang alternately. During a short walk (about three-quarters of a mile) I heard five mor...

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