首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
You Call It Music, They Call It an Air Raid Songs can have a powerful effect on people. Play " Gypsies, Tramps and Thieves"
You Call It Music, They Call It an Air Raid Songs can have a powerful effect on people. Play " Gypsies, Tramps and Thieves"
admin
2013-07-11
49
问题
You Call It Music, They Call It an Air Raid
Songs can have a powerful effect on people. Play " Gypsies, Tramps and Thieves" to many baby boomers, for example, and chances are they’ll run off, hands over their ears. Songs can have a powerful effect among birds, too. Consider the black-capped chickadee. When it sings its " chick-a-dee" song, its flock mates come running. The song is a warning that a hawk, owl or other predator is moving nearby, and the other chickadees arrive to harass the enemy until it leaves.
Researchers from the University of Montana have discovered that this warning call is a coded signal. By varying the call, a bird communicates to other birds the size of the predator, and thus the scope of the danger. " This is so far the most finely detailed alarm call system that we’ve found," said the lead researcher, Christopher N. Templeton, who is now a doctoral student at the University of Washington. The findings appear in the current issue of the journal Science.
Mr.Templeton and his colleagues exposed chickadees to 15 different species of predators and recorded and analyzed the calls the birds made. In addition to "chick-a-dee", the birds make a high-pitched "sect" call when they spy a predator flying in the air. Upon hearing this call, the other birds either dive for cover or remain motionless so as not to be spotted. But it’s the "chick-a-dee" call that the researchers focused on. "They change a number of different features about these calls," Mr. Templeton said. "But most are not audible to us except the number of dees’ at the end."
They found that the birds varied the number of "dee" sounds depending on the size of the predator. More "dees"—as many as 21 in one case—were sounded for smaller predators like the Northern pygmy owl. Because chickadees are small and fast, smaller, more quick-moving predators are more of a threat than larger ones.
The more "dees", the more chickadees show up to harass the predator, by dive-bombing it or making noises in its face. "The goal is to drive it out of their territory so that it is no longer a threat," Mr. Templeton said. This "mobbing" response to the calls is probably learned behavior, he said, a way that birds teach their young about risks. "It’s a means by which adults tell the kids in the flock, ’ These guys are dangerous,’" Mr. Templeton said.
Mr. Templeton and his colleagues conducted their research and found______.
选项
A、the responses of birds when they hear the alarming songs
B、the way birds locate where the predator is
C、the relationship between birds’ call pitch and predator size
D、the way adult chickadees teach their young to escape the danger
答案
A
解析
本题考查最后三段中的事实细节。[A]项在第三段第三句提到,为正确选项。[B]项在文中没有提到。由第四段首句可知,鸟发出“dee”音的数量而非音调,随着捕食动物的大小而变化,所以[C]项错误。由第五段后半部分可知,研究发现成年山雀教幼雀应对危险,但文章没有说明具体是怎么教授的,所以[D]项也不正确。
转载请注明原文地址:https://kaotiyun.com/show/wq4O777K
0
专业英语八级
相关试题推荐
DawnaWalterisoneoftheauthorsleadingthewayinBritainwithherbookthatattemptstohowevenatidy【M1】______so
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamassbasisorfindthegiftedfewandt
Askedwhatjobtheywouldtakeiftheycouldhaveany,peopleunleashtheirimaginationsanddreamofexoticplaces,powerfulpo
WilliamFaulknerwasborninOxford,Miss.Hehad【1】education,thenhejoinedtheBritishRoyalAirForceinCanadabecausehew
Astheever-increasingpopularityofcomputerandinternet,thelifeandthelifestylehasgreatlybeenaltered.Thefuturew
Theswingingsinglelifestyleofthestereotypeismostpossibleforurban,educatedprofessionalandtechnicalpeople.Onlythe
Wehearitalotthenewsthesedays:"Recyclenewspapersandsaveatree.Collectbottlesandcanssotheycanbereusedin
Teachersandotherspecialistsinearlychildhoodeducationrecognizethatchildrendevelopatdifferentrates.Givenanythingt
______isregardedbyAmericanas"thefatherofthecountry".
ThesecondpopulationmovementintheUnitedStatesbetween1890and1920mainlyfeaturedthepeople’smovingfrom______to______
随机试题
同一系统内同级机关之间的关系称为不相隶属关系。()
轻度脱水时的缺水量为:中度脱水时的缺水量为:
A.音色较差,声时长,连贯性较好B.音色较差,声时短,连贯性较差C.音色较好,声时短,连贯性较好D.音色较好,声时短,连贯性较差E.音色较好,声时长,连贯性较差全喉切除术后,采用人工发声装置,其发声特点
临床上怀疑有下列哪种疾病时禁忌穿刺
一般情况下,通过破坏性试验来测定材料的何种性能?[2014-006,2013-006]
对于设计单位不同意采纳的一般设计变更建议()。
在房地产住房抵押贷款中,由于借款人提前归还部分或全部贷款余额而给金融机构造成的风险称为()。
对权益结算的股份支付,无论是否立即可行权,在授予日应确认成本费用和资本公积。()
阅读下面的教学反思(节选),按要求答题。在上课过程中,我归纳了几个“最”。“最大胆的提问”,在我提出第一个问题后,一个同学站起来就引用史料,阐述了自己完全不同于历史的见解。不仅我,在场的人都很震惊。他的问题是:“项羽是个很残暴的人,曾有
我们的艺术家是具有特定感情的人,当然,________他________用形象来说话,________说教、开导,________他可以做一个好人,________却是个蹩脚的艺术家。
最新回复
(
0
)