美國摩天大樓殺數億候鳥 芝加哥居冠
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- US skyscrapers kill 600 million -- yes, million -- birds every year
- Buildings are killing up to 1bn birds a year in US, scientists estimate
- As many as a billion birds are killed crashing into buildings each year — and Chicago’s skyline is the most dangerous area in the country
- Downtown Chicago lights getting turned down for Earth Hour, bird migration