This is Scientific American's 60-second Science, I'm Susanne Bard. 这里是科学美国人60秒科学系列,我是苏珊娜巴德。 Like many birds, male white-throated sparrows belt out songs to defend their territories and attract mates. 和许多...
This is Scientific American's 60-second Science, I'm Jason Goldman. 这里是科学美国人60秒科学系列,我是杰森古德曼。 About a billion birds die from flying into buildings each year in North America. 北美每年约有10亿只鸟因撞...