1955, Department of Agriculture and Fisheries (Scotland), Scottish Agriculture, Volumes 35-36, page 209:ONE of the most interesting and controversial problems connected with the wood-pigeon is the huge winter flocks which many believe are reinforced by migrants or 'foreigners' from abroad.
2001, Michael R. Conover, Resolving Human-Wildlife Conflicts, page 155:For a decade, up to 60% of the wood-pigeon population were removed each winter.