[ T H E FOUR LETTERS which follow form a kind of special symposium on the difficulties of distinguishing Marsh Warblers Acrocephalus palustris and Reed Warblers A. sdrpaceus by their songs and even in the hand. When we received the first from K. Atkin and A. D. Townsend, we sent it to G. A. Pyman as one of those who have had great difficulty with a population of mimetic Reed Warblers in Essex and ...

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