首页
登录
职称英语
What does the speaker cite as an introduction to the topic? [br] [originaltext]
What does the speaker cite as an introduction to the topic? [br] [originaltext]
游客
2025-01-17
9
管理
问题
What does the speaker cite as an introduction to the topic? [br]
In the classic story, a boy tries to repeatedly fool his town into believing that there is a wolf on the prowl. This morality tale ends poorly for the boy, but a small Australian bird can do one better. When a pied currawong goes looking for brown thornbill nestlings to eat, the thornbill parents call wolf — or, actually, they call hawk. The false alarms fool the currawong into thinking that its own predator, the brown goshawk, is nearby. The tiny thornbill thus effectively outsmarts its large enemy.
To explore how this sophisticated ruse works, biologist Branislav Igic and his colleagues positioned a taxidermied currawong near thornbill nests while broadcasting nestling distress calls. The thornbills sounded their hawk alarm calls and even mimicked the alarms of other species. Igic also tested 18 currawongs by broadcasting the sounds of the thornbills’ mimetic and nonmimetic hawk calls. He found that the playback discouraged the currawongs from hunting.
The researchers think that alarm calls from what sounds like multiple callers might make the warning seem more reliable. Birds can adapt some very interesting and unique strategies to protect their young. The thornbills’ own hawk calls fooled the currawongs for 8. 3 seconds on average, but when Igic included the mimicked calls, too, the currawongs were distracted twice as long. That padding may provide enough time for the nestlings to escape the nest.
选项
A、To protect the nestlings.
B、To defeat the enemy.
C、To attract other callers.
D、To search for more food.
答案
A
解析
原文指出这是鸟类保护幼鸟的有趣而又独特的策略。
转载请注明原文地址:https://tihaiku.com/zcyy/3916098.html
相关试题推荐
Whatdoesthispassagetalkabout?[br][originaltext]Facebookistakingav
Whatdoesthispassagetalkabout?[br][originaltext]Facebookistakingav
Whatdoesthispassagetalkabout?[br][originaltext]Facebookistakingav
Whatdoesthispassagetalkabout?[originaltext]Facebookistakingaveryun
Whatdoesthepassagemainlytalkabout?[br][originaltext]Agrowingnumber
WhatisthesimilaritybetweenDanoneandDeoleo?[br][originaltext]TheFre
WhatisthesimilaritybetweenDanoneandDeoleo?[br][originaltext]TheFre
WhatisthesimilaritybetweenDanoneandDeoleo?[originaltext]TheFrenchgo
WhichplaceisnotintheplanofWenZhong?[br][originaltext]WenZhongis
WhichplaceisnotintheplanofWenZhong?[originaltext]WenZhongistakin
随机试题
[originaltext]Host:Today,I’mveryhappytohaveprofessorPornchaiwithme.H
UsingdatafromaresearchstudythattookplaceintheU.K.whichaskedfam
MeasuringHumanBehaviorPsychologicalTestingist
MysteryofTimeIfyoucanreadaclock,youcanknow
Divorcedoesn’tnecessarilymakeadultshappy.Buttoughingitoutinanunh
初孕妇,25岁,38周妊娠,双胎,LOA—RSA,头先露,平坐骨棘,宫缩规律,胎
115.党总支、党支部()的职责是,围绕本单位的中心工作,开展 多种形式的宣
国债期货到期交割时,用于交割的国债券种由()确定。A.交易所 B.多空双
饴糖的功效有A.补脾益气 B.润肺止咳 C.清热解毒 D.缓急止痛 E.
地高辛心脏毒性的诱因包括A.低血钾 B.高血钙 C.低血镁 D.低血钠
最新回复
(
0
)