First, birds were given coloured rings to wear on their legs, so that binocular-wielding “twitchers”[1] from around the globe could see which went where.
First, birds were given coloured rings to wear on their legs, so that binocular-wielding “twitchers”[1] from around the globe could see which went where.
以前人们在鸟脚上套上不同的颜色圈，这样世界各地手执望远镜的“追鸟族”就可以观察哪一类鸟飞到了哪里。