THE aerial performances of Rooks (Corvus f. frugilegus) in autumn, as described by the Rev. E. U. Savage (antea, p. 57), have, I venture to suggest, a territorial significance. The visits of these birds to their nesting place or home are always attended by excitement and play. In September and October visits during the day are much more frequent than at other times in the non-breeding season and p...

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