千万年来,动物与人类都在为生存而战,能存活到现在的生物,都是以改变自己的方式,来适应不断变化的生存环境。市场上不少人高价收购美洲鹰,人们疯狂猎捕,它们却没有绝迹。何故呢?一名鸟类学家愕然地发现这种巨鸟竟然生活在拥挤狭窄的高山岩洞中。洞中岩石形状奇异,有的薄如刀片,有的尖如石钉, For thousands of years, both animals and humans have been fighting for existence and surviving to present life, all changing their way to adapt to the ever-changing living environment. Many people in the market buy the American Eagle at a high price and people hunt wildly, but they are not extinct. Why? A ornithologist stunned to find that this giant bird actually living in crowded narrow alpine caves. Hole rock strange shape, some as thin as a blade, some sharp as stone nails,