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 suggested by this form of behaviour. His citations of literature, however, g o no further back than 1948, and I should think it a pity if the record of t...

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