Radar picks up on bird migration. But how do we tell birds and storms apart?
鸟群形状、速度和结构是破译雷达读数是鸟类、蝙蝠、昆虫还是天气的关键
Parrot uses his broken beak to become a dominant male
一只受伤的啄羊鹦鹉只剩下半张喙，它利用剩下的部分作为武器，使他能够在圈养的鸟群中占据主导地位
