DURING the spring of 1947 I saw what certainly appeared to be bigamous behaviour by a male Rook (Corvus f. frugilegus) Unfortunately, the observations were rather disjointed, a continuous watch not being possible. On March 14th a well-advanced nest was seen in an oak-tree at Lympstone, Devon, and nearly a mile from the nearest rookery. Even on this date a third bird appeared to be interested in t...

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