首页
登录
职称英语
One of Nature’s most exciting mysteries is how pigeons find their way home o
One of Nature’s most exciting mysteries is how pigeons find their way home o
游客
2024-08-02
6
管理
问题
One of Nature’s most exciting mysteries is how pigeons find their way home over vast distances. Now German scientists believe they have discovered how the birds do it. Research has revealed that tiny iron structures in their beaky(鸟嘴)allow them to analyze the earth’s magnetic field—much like a compass(罗盘). Through the signals picked up, the birds can work out where they are and set out on the best course home.
As well as pigeons, many other birds display a remarkable ability to fly thousands of miles to return to a specific garden or tree year after year. Scientists are suggesting they may have similar iron-containing cells in their beaks.
In the past, experts have suggested the birds use the sun and stars to navigate, although in 2004 researchers found that many follow roads rather than their internal compass to plan their route. However, scientists have long believed that they can in some way use the natural magnetism of the earth to navigate. The recent study by German scientists has revealed how this may be possible.
The research used X-rays to examine the upper beaks of pigeons. They found that within the skin lining are tiny iron-containirg particles(微粒)in nerve branches which are arranged in a 3D pattern. The team, led by Gerta Fleissner, concluded that this allows the birds to react to the external magnetic field of the planet and work out their precise location.
She pointed out that similar iron-containing cells had been found in the beaks of robins, warblers and chickens so it may well turn out to be the way that other species also navigate.
Scientists are still discovering more about the incredible abilities of the pigeon.
Questions: [br] Pigeons find their way home by picking up signals from______.
选项
答案
the earth’s magnetic field
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3702158.html
相关试题推荐
CharlesDickenswasafamousnineteenth-centurywriterandthesignature"C
CharlesDickenswasafamousnineteenth-centurywriterandthesignature"C
CharlesDickenswasafamousnineteenth-centurywriterandthesignature"C
CharlesDickenswasafamousnineteenth-centurywriterandthesignature"C
CharlesDickenswasafamousnineteenth-centurywriterandthesignature"C
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
随机试题
AudienceofWritingAudienceisaveryimportantconc
Crisiswouldbetherighttermtodescribethe______inmanyanimalspecies.A、abo
DietandtheDemandforFoodThedemandfordifferentfoodp
挂接在总线上的多个部件()A.只能分时向总线发送数据,并只能分时从总线接收数据
A.静脉注射地西泮B.苯妥英钠C.乙琥胺D.静脉注射硫酸镁E.氯丙嗪癫痫小发作首
关于招标人委托招标代理机构办理招标事宜,下列说法正确的有()。A.招标人与招标
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
资源性国有资产具有()的特点。A.天然性 B.有限性 C.不可计量性 D
下列关于土的抗剪强度说法中正确的是()。A.土的抗剪强度是指土在外力作用下抵抗
病史采集 简要病史:男性,15岁,游走性双膝关节疼痛1个月。 要求:你作为住
最新回复
(
0
)