Around 600 million birds die every year in the United States after striking tall buildings -- with Chicago, Houston and Dallas being especially deadly, according to research from the Cornell Lab of Ornithology.
원문출처 : https://www.cnn.com/2019/04/08/americas/bird-building-collisions-scli-intl-scn/index.html
원문출처 : https://www.cnn.com/2019/04/08/americas/bird-building-collisions-scli-intl-scn/index.html