Letters

01 April 1986 Comments Letters Escapes? Some years ago, Derek Goodwin and the late Derrick England published some long comments on the problem for birdwatchers of escaped cage birds (Brit. Birds49: 339-349; 67: 177-197). Since those papers, a new generation of birders has appeared, ...
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Letters

01 March 1959 Comments Letters "SUB-SONG" AND "SECONDARY SONG" SIRS,---With regard to the paper by Miss P. M. Piicher and myself on "The nature of sub-song" (antea, vol. li, pp. 509-514), I very much regret to find that we were incorrect in stating that the term "sub-song" was used by ...
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