At Colorado State University Assistant Biology Professor Kyle Horton works on Birdcast which Maps bird migration like this, showing nearly 800 million birds over the United States on just one night.

科罗拉多州立大学生物学助理教授凯尔·霍顿在 Birdcast 公司工作，该公司绘制了这样的鸟类迁徙图，显示了美国近 8 亿只鸟在一个晚上的迁徙情况。