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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Letters

01 May 1946 Comments Letters SIRS,--Mr. N. D. Pullen, Mr. H. G. Hurrell and Miss N. C. Hicks (antea, Vol. xxxviii, pp. 206, 300 and 360) have drawn attention t o an interesting problem of behaviour. I have observed t h e " digging " in the bottom of the nest, as described by the abov...
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