当画眉鸟夫人离开巢穴去捉虫子回来喂养她的孩子们的时候,就有四张小画眉鸟的嘴巴和一张巨大布谷鸟的嘴巴大张着。
When Mrs. Thrush leaves the nest to get a worm and comes back to feed her young, there are four little thrush mouths and one huge cuckoo mouth.
研究人员把16只鸟按顺序4只排成一排,发现外面的鸟在32%的时间里处于半睡眠状态,而内部的鸟只有12%的时间处于半睡眠状态。
Rotating 16 birds through the positions in a four-duck row, the researchers found outer birds half-asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots.
不论群里有多少鸟,每只鸟的飞行的方向和速度,同其他鸟的方向和速度都是不变化的。
Regardless of size, the correlations of a bird’s orientation and velocity with the other birds’ orientation and velocity didn’t vary.
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