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
2025-03-08
28
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:http://tihaiku.com/zcyy/3988469.html
相关试题推荐
你离开教室时,别忘了关灯。Don’tforgettoturnoffthelightswhenyouleavetheclassroom.
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemst
Elephantsdon’tforget—atleast,femaleelephantsdon’t.Elephantfamiliesa
随机试题
InAmericaalone,tippingisnowa$16billion-a-yearindustry.Arecentpol
TheScienceBehindtheNumbersThatGovernOurLivesA)Numbersa
JusticeisoneofthemostpopularcoursesinHarvard’shistory.Nearlyone
已知A,B和A+B均为可逆矩阵,试证也可逆,并求其逆矩阵.
由曲线和直线x=1,x=2,y=-1围成的图形,绕直线:y=-1旋转所得旋转
下列各组汉字全是会意字的一组是()A.众若眉而 B.间益逐鸟 C.初齿网休
典型调查( )A.是一种非全面的专门调查 B.可以补充全面调查的不足 C.
高校心理咨询中常用的方法有()、()和()。
A.相生 B.相克 C.相乘 D.相侮 E.制化“生中有克,克中有生”称
有一服用地西泮的女性失眠患者,近期胃溃疡发作,医生开具药物西咪替丁抗溃疡,三天后
最新回复
(
0
)