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
33
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
AimlessnesshashardlybeentypicalofthepostwarJapanwhoseproductivityandsocialharmonyaretheenvyoftheUnitedStates
OncefoundalmostentirelyinthewesternUnitedStatesandinAsia,dinosaurfossilsarenowbeingdiscoveredonallsevencont
"Iwanttocriticizethesocialsystem,andtoshowitatwork,atitsmostintense."VirginiaWoolf’sprovocativestatementa
DawnaWalterisoneoftheauthorsleadingthewayinBritainwithherbookthatattemptstohowevenatidy【M1】______so
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamassbasisorfindthegiftedfewandt
WilliamFaulknerwasborninOxford,Miss.Hehad【1】education,thenhejoinedtheBritishRoyalAirForceinCanadabecausehew
CriticalThinking&InnovativeWritingI.Heateddiscussionaboutthe(1)_____ofEng-lishteachingandlearning.1)bottle-nec
NewEducationalTechnology:ChallengesandPotentialI.Thecriticismofcomputersandmultimediatechnology—A(1)_____ofunders
Intheintroductorychapterofherbook,Anyonsharesapersonalstoryinvolvingherfather.Anyon’sbriefdiscussionofherfam
OnewetnightIwascominghomethroughHydeParkfromworkinglateonajobinPaddington.Painandwindandsweptboughsands
随机试题
在接团当天,地陪应及早与有关方面联系,了解旅游团()。
A.异戊巴比妥B.水合氯醛C.硫酸镁D.卡马西平E.乙琥胺
属于新生儿特殊生理状态的表现有()
患者,女,35岁。半年前出现食欲缺乏,厌油腻,腹胀,小便色黄,未重视,现发现HBsAg阳性,血清ALT升高,无黄疸,无畏寒、发热,肝区隐隐作痛,考虑诊断为
根据机械来源的不同,必须经过不同的检验和试验,一般检验的方法和步骤可分为()。
某企业期末“应收账款”账户为借方余额207000元,其所属明细账户的借方余额合计为280000元,所属明细账户贷方余额合计为73000元,“坏账准备”账户为贷方余额1000元,其中针对应收账款计提的坏账准备为680元,则该企业资产负债表中“应收账款”项目的
关于期货合约要素,下列叙述不正确的是()。
以下适用“营改增”相关免税政策的有()。
请示分页存储管理方案的主要特点是(33)。
__________(任何尊敬他人的人)willberespected.
最新回复
(
0
)