为什么小鳄鱼多少钱一只睁一只眼睡觉

我的宠物泰鳄60厘米,发现几天都爱睁一只眼闭一只眼呆着,是否正常呢?还有个事就是今天发现鳄鱼左眼睛上有白色物体,不知道是什么,有影响吗。
我的宠物泰鳄60厘米,发现几天都爱睁一只眼闭一只眼呆着,是否正常呢?还有个事就是今天发现鳄鱼左眼睛上有白色物体,不知道是什么,有影响吗。
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var sogou_ad_width=690;鳄鱼可“单半球睡眠” 一半大脑休眠一半清醒(图)-中新网
鳄鱼可“单半球睡眠” 一半大脑休眠一半清醒(图)
日 14:40 来源:羊城晚报  
  澳大利亚的研究人员早前发现鳄鱼也像海豚、海象等动物那样,可以“单半球睡眠”,即睡觉时同时保持一半大脑休眠,一半大脑清醒。
  研究人员在观察鳄鱼睡觉时,发现它们有时会睁一只眼、闭一只眼,有时也会两只眼睛都闭上。通过研究测试,他们认为鳄鱼虽然多数情况下睡觉时都会闭上双眼,全面进入休眠状态,但它们仍然可以保持“单半球睡眠”,如果睡前遇到过威胁或者感到周遭有危险情况,他们就会只闭上一只眼睛睡觉,睁开另一只眼保持警戒。
  过去已有研究表示,海豚、海象等水生哺乳动物以及一些鸟类和部分爬虫类都会有这种“睁单眼睡觉”的行为,但如今人们发现原来鳄鱼也会这样。 (小绿)
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走进科学:为什么鳄鱼要睁着一只眼睡觉
作者:晨霞发表时间:浏览:248
  Why Crafty Crocodiles May Be Sleeping With One Eye Open  为什么鳄鱼睁一只眼睡觉?  While for humans the expression &sleep with one eye open& is just a
metaphor to keep alert, for some animals it is a way of life. Called
unihemispheric sleep, it is the ability to snooze with one eye open and the
corresponding half of the brain awake, while the other half rests.  对人类来说,“睡觉睁一只眼”只是对要“提高警惕”的一个比喻;但是对某些动物来说却是一种习性。一半大脑处于休息状态,另一半大脑时刻保持警惕,这种现象被称为“半脑睡眠”。  [为什么鳄鱼睁一只眼睡觉?.jpg]  Researchers believe that this talent that has been observed in marine
mammals like dolphins and seals as well as numerous bird species, serves many
purposes. Birds use it to keep an eye out (literally) for predators while
dolphins do it to keep track of their pods and young ones. Many social animals
are also believed to use the technique to keep track of any interesting
activities going on around them.  科学家相信,这种在海豚海狮等海洋哺乳动物和多数鸟类身上存在的天赋,实际上有很多用途。鸟儿睡眠时一只眼保持警惕是为了免受捕食者伤害,海豚却是为了看护自己的幼崽。很多群居动物也用此技能来保持对身边任何有趣活动的关注。  Now researchers from Australia's La Trobe University have discovered that
crocodiles may have also evolved this capability. The scientists began by
placing three juvenile saltwater crocodiles inside a large enclosure at the
University's aquarium and filming their behavior. They noticed that when left
undisturbed, the reptiles spent less than an hour with one eye open. The
crocodiles instead seemed to prefer snoozing with both eyes shut just like the
rest of us.  澳大利亚La
Trobe大学的研究者发现,鳄鱼似乎也进化了出此技能。他们在大学水族馆腾出地方,圈禁了3条幼年咸水鳄并监控它们的表现。他们发现,在无外界打扰的情况下,这些爬行动物只有不到一小时睁一只眼闭一只眼。似乎大多数时间里,它们跟人类一样,是紧闭双眼睡觉的。  However, things changed drastically when the researchers introduced an
external stimulus. They began by bringing a new young crocodile to the
enclosure. Though it was one of their own, the other reptiles immediately
appeared to perk up. The researchers noticed that the crocodiles slept with one
open eye directly aimed at the newcomer, for longer amounts of time.  然而,当研究者们加入了干扰,情况立刻转变了。他们加了一只新鳄鱼进入围栏。虽然都是同类,其他鳄鱼还是立刻进入警戒状态。它们开始针对这个新来的鳄鱼,更久地保持一只眼睁着。  If the tests are positive, it would indicate that birds, mammals and
reptiles all display this behavior. The only ones that don't? Land-based animals
and humans that need to fully shut down the brain and eyes for a snooze. Lesku
says that while we have always called the one-eyed napping animals odd it may be
that they are perfectly normal!  如果实验有效,我们可能会获得鸟类、哺乳动物和爬行动物都有此行为的结论。什么动物例外呢?陆地动物和人类睡觉时,才需要双眼紧闭。Lesku表示,虽然我们认为睁一只眼闭一只眼睡觉的动物奇怪,但其实这种行为才最正常不过。  以上材料的无阻碍阅读需要一定的英文基础,那么读完这则材料的你是不是对英语的学习有更大的兴趣了呢?那还等什么,快加入洛基英语,与我们一起学习英语吧!
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