Birds that are literally halfasleep with one brain hemisphere alert and the other sleep-control which side of the brain remains awake, according to a new study of sleeping ducks!

• 最新的一项对鸭子睡眠的研究表明,鸟类实际上处于半睡眠状态,其大脑的半球处于警戒状态,而另一半则用于控制睡眠,处于清醒状态的。