Letters

01 November 1993 Comments Letters Red-crested Pochard hybrids. The occurrence of hybrids involving Red-crested Pochards Netta rufina may not be so unusual as is suggested by A. H. J. Harrop's note (Brit. Birds 86: 130). A. P. Gray (1958) recorded hybrids with 11 species of the genus An...
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Letters

01 June 1958 Comments Letters S I R S , -- U n d e r the above title (anlea, vol. L, p p . 432-434), R. Hewson has usefully drawn attention to the aerobatics-- familiar in individuals--that are sometimes performed by flocks of Ravens (Corvus corax) and has discussed questions suggeste...
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