猫为何很少眨眼?

2025-04-05 10:55:40
推荐回答(1个)
回答1:

养过猫的人都知道,猫是很少眨眼睛的,即便是偶尔眨眼,也不是像人类那样转瞬即逝,而是慢吞吞的闭上眼后再慢慢睁开:

事实上,猫是哺乳动物中眼睛与身体比例最大动物之一,加之猫的大眼睛老是圆圆的瞪着一动不动,所以也就可以理解,为什么有人看了猫会觉得很害怕。

那么猫为什么很少眨眼?不眨眼它们的眼睛不干疼吗??

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人类眨眼是为了在眼球表面涂上一层泪水,以免眼睛干涩或遭受细菌侵袭。内眼角上方的泪腺会经常分泌泪水,眼睛眨动时眼睑可以像车子的雨刷那样用这些泪水把眼球刮擦干净。其实不止人类,凡是眼球裸露的陆地动物(比如哺乳动物和鸟类),一般都要经常眨眼以保证眼部舒适――除非眼睛表面有一层透明覆盖物来避免眨眼的麻烦,比如蛇。

不同动物眨眼的方式也不同:人类和猴子、猩猩等灵长类动物会单独用上眼睑来进行眨眼,但是其他哺乳动物,更愿意用上下眼睑一起闭合的方式,即它们会用上下眼皮同时向眼中央靠拢。而鸟类在眨眼的时候,甚至可以保持上下眼睑都不动――因为它们的眼睛上还有一层可以活动的薄膜(称为瞬膜),将它从内眼角推到外眼角再拉动回来,就完成了一次眨眼:

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另外还有不少爬行动物游泳时把瞬膜作为泳镜使用:

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事实上,很多哺乳动物的内眼角都有退化了的瞬膜,人的眼睛也不例外,不过只剩下一点点残留的褶皱了:

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接下来就可以解释猫为什么很少眨眼了:猫眼中的瞬膜退化的不彻底,虽然没有鸟类那种可以覆盖整个眼睛的能力,但是也能遮盖眼睛一大半的面积。但猫又没有足够强大的眼睑肌肉帮助自己快速的拉开瞬膜,倘若猫像人一样快速眨眼,瞬膜会露出来遮住眼睛,但又无法迅速缩回,非常麻烦。于是,猫咪只好慢吞吞的闭眼,再慢吞吞的睁开,防止自己的瞬膜露出来碍事――即便如此,你家如果有养猫,还是有可能在它们睡眼惺忪的时候,看到它们没有收拾好的瞬膜(如果猫咪长期瞬膜突出,就是患眼病了,要去看医生哦):

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既然如此,那猫如何保持眼部湿润清洁呢?

――由于猫眨眼实在是麻烦,它们就进化出了比较发达的泪腺:只需上眼睑轻轻下垂一点,下眼睑也同时轻轻上抬一点,就可以让泪水布满眼睛表面,完成眨眼的作用――完全不需要闭上眼睛。而这个动作实在太轻微了,所以通常不易察觉。

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