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
7
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、They use their nails as tools.
B、They use their tongues as tools.
C、They are born to use tools.
D、They are trained to use tools.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3521762.html
相关试题推荐
[originaltext]Inaworldwheretechnologyisincreasingourcapacitytoconn
[originaltext]Inaworldwheretechnologyisincreasingourcapacitytoconn
[originaltext]Hello,everybody.Today,Iamgoingtotalkaboutbirdsusing
[originaltext]Isfoodmedicine?Thequestionhasneverbeensocurrent.It’s
[originaltext]Isfoodmedicine?Thequestionhasneverbeensocurrent.It’s
[originaltext]Agroupofcollegestudentsishopingtoplaceasatellitepow
[originaltext]Agroupofcollegestudentsishopingtoplaceasatellitepow
[originaltext]Asinglecigarettesoldonastreetcornermaynotcostalot
[originaltext]Asinglecigarettesoldonastreetcornermaynotcostalot
[originaltext]NovemberisAlzheimer’sAwarenessMonthintheUnitedStates.
随机试题
A、Thedesignofthestoryline.B、Thedescriptionofpeople’scharacters.C、Thet
A.5/6 B.1/6 C.1/3 D.1/5
下面关于信息工程监理表述不正确的是( )。A.信息系统工程监理与设备监理是我国
以下不属于建设工程施工合同争议的解决办法的是( )。A.和解、调解 B.仲裁
在雷电特别强烈地区采用双避雷线,少雷地区不设避雷线的防雷方式适合于( )的高压输
颤证病理因素之火有实火与虚火之分,实火为A.五志过极化火 B.湿热内蕴 C.
检定结束后提交的检定结果中必须包括()。[2010年真题] A.检定过程报告
我国期货公司从事的业务类型不包括()。A.期货经纪业务 B.期货投资咨询业务
关于会计凭证保管的说法,正确的是()A.原始凭证较多时,可单独装订 B.出纳
甲亢治疗时粒细胞减少多见于 A.放射性核素131I治疗 B.复方碘溶液
最新回复
(
0
)