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家鴉擴散 House Crow Spreading

Does anyone know how many House Crows there are estimated in HK?? I remember seeing them every day for some time few years back, but now I only see a few flying about in certain areas. Surely the population control schemes are working??
As The Crow Flies- a Hong Kong Birding Blog
http://www.matthewkwanbirding.blogspot.hk

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