(单词翻译:单击)
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” 。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
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
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
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
译文属可可英语原创,未经允许,不得转载 。