翠鸟牵巢

In order to avoid calamities1, at first the kingfisher always selects a high place to build its nest.

But when the young birds are hatched, it will move to a place a little lower to build its nest. This is because the kingfisher is particularly fond of its offspring and is afraid they might fall down from a high place.

When the young birds grow beautiful feathers, the kingfisher will become even fonder of them and more protective, so it will move its nest further downward, with the result that the young birds are easily taken away by people.

翠鸟起先为了避免灾祸，总是选择高的地方筑巢。

但是，等到孵出小鸟以后，它就到少许低一点儿的地方筑巢。这是因为它特别爱护小鸟，生怕它们从高处摔下来。

等到小鸟长出了美丽的羽毛以后，母鸟就更加喜欢和爱护它们了，于是又向下搬巢，结果小翠鸟却被人们轻而易举地掏走了。

1 calamities

n.灾祸，灾难( calamity的名词复数 )；不幸之事

参考例句：

They will only triumph by persevering in their struggle against natural calamities. 他们只有坚持与自然灾害搏斗，才能取得胜利。 来自《现代汉英综合大词典》

One moment's false security can bring a century of calamities. 图一时之苟安，贻百年之大患。 来自《现代汉英综合大词典》