AT a rookery in Surrey, on March 30th, 1940, at 12.5 p.m., Rooks (Corvus f. frugilegus) were seen to change over at the nest. One bird--obviously a male--flew in and standing on the nest edge fed his plainly visible mate. During the meal wing-action by the hen was observed. This was no doubt a form of " submissive ceremony " which has been described by various observers. After this the sitter was s...

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