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House sparrow population in Europe drops by 247m
www.theguardia...
Where Have All the House Sparrows Gone?
blog.nature.or...
Mark and Recapture
en.wikipedia.o...
Decline of the North American avifauna
www.science.or...
Study finds even the common House Sparrow is declining
news.cornell.e...
Birds Are Vanishing From North America
www.nytimes.co...
مجاعة الصين الكبرى
ar.wikipedia.o...
Great Chinese Famine
en.wikipedia.o...