Letters

01 August 1997 Comments Letters Steven Gregory (Brit. Birds 90: 150-151) has made three interesting points about hybridisation between Ruddy Ducks Oxyura jamaicensis and White-headed Ducks O. leucocephala. First, such hybridisation need not be a disaster, but could increase the adapt...
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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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