首页
登录
职称英语
[originaltext] Hello, everybody. Today, I am going to talk about birds using
[originaltext] Hello, everybody. Today, I am going to talk about birds using
游客
2024-03-10
17
管理
问题
Hello, everybody. Today, I am going to talk about birds using tools.
Scientists have long known that a crow native to New Caledonia is able to use tools. The birds use them to remove food from deep inside holes and crevices. Now, American researchers have discovered a second species of crow that uses tools. Researchers with the San Diego Zoo reported on their experiments with Alala crows—a species from the Hawaiian Islands. There are no more Alala crows living in the wild. But there are some of the birds still living in a protected area in Hawaii. They are considered critically endangered. In an experiment, the researchers placed pieces of food in crevices inside a big piece of wood. The holes are too deep for the birds to reach with their beaks. But, by using small pieces of wood held in their beaks, the birds quickly found a way to get the food. The scientists said the crows demonstrated the ability to reach food in those cannot-reach-it places. The birds used small objects as tools, sometimes changing them by shortening a too-long stick. They also made tools from plant material. "Current evidence strongly suggests that tool use is part of the species’ natural behavioural pattern" , Rutz said.
Alalas are not the only intelligent crows to use tools. The other is the New Caledonian crow on New Caledonia Island in the Pacific Ocean. The New Caledonian crow can use tools to remove insects and other food from dead wood and plants.
How did crows learn to use tools? How did these birds learn to use tools? Scientists think their tool-using skills may have resulted, in part, from conditions in their Pacific island habitat. The two species have one more thing in common: unusually straight beaks. The birds use their beaks like the way people use thumbs on their hands.
All the Alala crows left in the world live in Hawaii. There were less than 20 Alalas left in the late 1990s when scientists decided to bring them into a protected area to increase their population. Now, there are over 100 birds living in captivity. The San Diego Zoo said its researchers tested almost all of them and "they determined that the vast majority of them spontaneously used tools. " Scientists are working to increase the population so that the Alala can be released back into the wild. They plan to release some of the birds back into the wild later this year.
Questions 23 to 25 are based on the recording you have just heard.
23. What does the speaker say about Alala crows?
24. What does Rutz say about the tool use of Alala crows?
25. What can we learn about the two species of crows?
选项
A、Some of them are living in the wild in Hawaii.
B、None of them live in the wild.
C、They are the most valuable species of crows.
D、They live in deep holes on the rock.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3521761.html
相关试题推荐
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext]Pianosarenormallyfoundinbuildingforobviousreasons.Howeve
[originaltext]Pianosarenormallyfoundinbuildingforobviousreasons.Howeve
[originaltext]W:Hello.M:Hello,isthatthereferencelibrary?W:Yes.CanI
随机试题
Whichofthefollowingisthebesttitleforthepassage?[br]Accordingtothe
[originaltext]M:I’mEllanandIworkfortheStudentUnion.CanIaskyouafe
现在要给中国的背包旅行现象找一个确切的渊源,恐怕不是件太容易的事。不过这种生态自助型的新旅游方式,业已吸引了成千上万的爱好者。而想要成为“驴友”,你不一
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
根据现行交易规则,2014年11月17日,中国金融期货交易所挂牌交易的5年期国债期货合约有()。A、TF1412B、TF1501C、TF150
下列关于选题与审稿之间关系的表述,错误的是( )。A.选题和审稿是相互补充、相
操作系统的作用及分类
A.珠蛋白生成障碍性疾病B.缺铁性贫血C.巨幼细胞性贫血D.再生障碍性贫血E.急
某建设项目只有一个单项工程,则其综合概算除了单位建筑工程概算、设备及安装工程概算
行政调解:是指在国家行政机关的主持下,以当事人双方自愿为基础,以国家法律、法规及
最新回复
(
0
)