美国科罗拉州大峡谷中生活着一种雕,它们用一种被称为“铁树”的树枝筑巢。这种树枝不仅像名字所言一样坚硬,枝上还生着许多刺,这样可以使雕巢能够牢固地建在峡谷的悬崖上。巢建好后,雌雕要在上面铺上树叶、羽毛、杂草,防止幼雕被刺扎伤。随着幼雕渐渐长大,雌雕本能地感到,为了让幼雕生存下来,就必须让它们离巢。 A carved vulture lives in the Grand Canyon of the United States in Colorado, nesting in a branch called the “iron tree.” This branch is not only as hard as its name suggests, but also has many thorns on its branches, so that the nest can be firmly built on the canyon cliffs. After the nest is built, the female carving is covered with leaves, feathers and weeds to prevent the young carving from being stabbed. With the gradual growth of baby eagles, the female carves instinctively feel that in order for the baby eagles to survive, they must leave their nests.