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
5
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
Therearemanywaysinwhichthephenomenaoflanguageandcultureareintim
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasur
Thesun,rain,andfrosthaddamagedthe_______wallofthisoldbuilding.A、exte
10WaysObamaCouldFightClimateChange[A]Oneofthebiggest
符合恶性肿瘤特点的描述是A、与周围组织无粘连 B、有完整包膜 C、边界清楚
学会合作 ①加拉帕戈斯群岛中有一个叫品左恩的岛屿,岛上生存着一群莺鸟,,它们以
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
附图中,燎去毛须,置沸水中略煮或蒸透后晒干或燎后直接晒干的图示中药是()
在再生障碍性贫血的治疗中,下列属于促进造血 的药物是 A.抗淋巴细胞球蛋白
建设工程施工劳务分包合同中,劳务分包人在施工现场内使用的安全保护用品,由劳务分包
最新回复
(
0
)