首页
登录
职称英语
Elephants don’t forget—at least, female elephants don’t. Elephant families a
Elephants don’t forget—at least, female elephants don’t. Elephant families a
游客
2024-01-18
60
管理
问题
Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family group’s survival, according to a study published in April by Karen McComb, a biologist at Sussex University in England.
Elephants announce their presence by making a deep, long sound, a practice referred to as contact calling(联络呼叫). An unfamiliar call may mean that an elephant from outside the family group is nearby. A stranger can cause trouble, interrupting feeding or disturbing the young. So an elephant
matriarch
signals the family to gather around her; then they all lift their trunks in the air to smell the unfamiliar caller. False alarms can disturb the group and take time and energy away from feeding, so survival may depend in part on getting it right.
Working with Cynthia Moss, who founded the Amboseli Elephant Research Project in Kenya 30 years ago, McComb tested the social knowledge of 21 Amboseli elephant families with matriarchs 27 to 67 years old. She played recordings of contact calls to each family and found that the oldest matriarchs were much better at picking out unfamiliar calls. In fact, a group with a matriarch in her fifties was several thousand times more likely to form into a group upon hearing an unfamiliar contact call than when hearing a familiar call. However, families with younger matriarchs were less than twice as likely to gather together upon hearing an unfamiliar contact call as compared with a familiar call. And they gathered together a lot. Moreover, the social knowledge of older matriarchs translated into favourable results: Families with older matriarchs produced more baby elephants in each female-reproductive year.
This finding shows how difficult it is to protect the oldest members of elephant families. As elephants age, they continue to grow larger, as do their much wanted tusks(象牙). So the older and wiser a matriarch is, the greater the chance she will be killed. About 800,000 elephants have been killed by people in the past 20 years. [br] When do elephants form into a group?
选项
A、When they are feeding the young.
B、When they see a familiar elephant.
C、When they are giving birth to baby elephants.
D、When the leading elephant gives out a warning.
答案
D
解析
由第二段“An unfamiliar call may mean that an elephant from outside the family group is nearby.A stranger can cause trouble…”可知D为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3373907.html
相关试题推荐
ForgetBrother,CanYouSpareaDime?Thethemesongofthisrecessionmightw
ForgetBrother,CanYouSpareaDime?Thethemesongofthisrecessionmightw
ForgetBrother,CanYouSpareaDime?Thethemesongofthisrecessionmightw
[originaltext] (16)Theysaythatelephantsneverforget;itturnsouttheyca
Everyonebecomesalittlemoreforgetfulastheygetolder,butmen’smindsdecl
Iwillneverforgettheyears______webothspentinthelittlevillage.A、whenB、
73.Everyonebecomesalittlemoreforgetfulastheygetolder,butmen’smi
73.Everyonebecomesalittlemoreforgetfulastheygetolder,butmen’smi
73.Everyonebecomesalittlemoreforgetfulastheygetolder,butmen’smi
Somepoorfamiliescannotaffordthetuition______oftheirchildren.A、feesB、pa
随机试题
DavidLandes,authorofTheWealthandPovertyofNations:WhySomeAreSoRi
BeforeDNAfingerprintingisused,suspects______.[br]TheNationalAcademyof
Theseniorpartner,OliverLambert,studiedtheresumeforthehundredthtime
下列引起急性胃炎的病因中,不属于应激因素的是()。A.颅内病变 B.大手术
下列关于风机盘管机组静压的表述,哪几项是符合现行国家标准的?()A.风机盘管
抗原抗体反应形成明显沉淀物条件为A.抗原显著多于抗体B.抗体略多于抗原C.抗原抗
坚守高尚情操.知荣明耻,严于律己,以身作则,关心集体,团结协作,尊重同事,尊重家
公司简介的功能包括( )。A.传达公司的价值观B.让应聘者明确期望C.使应聘者
在已经产生了AgCl沉淀的溶液中,能使沉淀溶解的方法是()。A.加入HCl溶
某工程双代号网络计划如下图,其计算工期是()天。 A.11 B.13
最新回复
(
0
)