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为什么鸟睡觉时睁着眼睛?

为什么鸟睡觉时睁着眼睛?

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为什么鸟睡觉时睁着yan睛?

鸟儿在睡觉时，每隔一会儿睁一下yan睛，窥视四周的动静，保持警惕免遭敌人的袭击。鸟类学家把鸟儿们这zhong似睡非睡的状态，叫zuo“窥视”。鸟类学家们观察发现，一般地说，鸟类每分钟睁10次yan，如果附近有敌人，它们每分钟则要睁30至40次yan呢！而它们的睡眠效果却仍然跟人熟睡差不多！

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