In Europe, the breeding population is estimated to number 260,000-460,000 breeding pairs, equating to 780,000-1,380,000 individuals (BirdLife International 2004). Europe forms 5-24% of the global range, so a very preliminary estimate of the global population size is 3,250,000-27,600,000 individuals, although further validation of this estimate is needed. National population estimates include: c.10,000-100,000 breeding pairs in China; < c.100 introduced breeding pairs in Taiwan; c.10,000-100,000 breeding pairs in Korea; c.100-10,000 breeding pairs in Japan and possibly c.100-10,000 breeding pairs in Russia (Brazil 2009). Population Trend
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