严寒的北极地区,因为缺少植被,给鸟类生活造成了很大麻烦,各种鸟儿都想尽办法适应寒冷的气候。这里有一种绵凫鸟,在生育以前,它们会强忍剧痛从自己身上拔下大量的羽毛来筑巢。它们用嘴咬着自己的羽毛,脑袋使劲一甩便拔下一根,每拔一根便痛得颤抖一下。据说,绵凫鸟忍受这种疼痛来筑巢实属无奈之举,它们要延续自己的种族,就必须做出这样的牺牲。只有在松软而 The arctic Arctic region, which has caused a lot of trouble for birdlife because of the lack of vegetation, has tried its best to adapt to the cold weather. There is a kind of wadding bird, which, before giving birth, will endure the pain of pulling a lot of feathers from themselves to build a nest. They bit their own feathers with their mouths, pulling their heads off and pulling them one by one. It is said that cottonworms endure this pain to build a nest is helpless move, they want to continue their race, we must make such a sacrifice. Only in soft