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
2023-08-07
25
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/2905501.html
相关试题推荐
[originaltext]M:YouareaprofessorofPhysicsattheUniversityofOxford;
[originaltext]M:YouareaprofessorofPhysicsattheUniversityofOxford;
[originaltext]M:Doyouthinkdreamshavespecialmeanings?W:No,Idon’
[originaltext]M:Doyouthinkdreamshavespecialmeanings?W:No,Idon’
[originaltext]M:YouareaprofessorofPhysicsattheUniversityofOxford;
[originaltext]M:YouareaprofessorofPhysicsattheUniversityofOxford;
[originaltext]M:YouareaprofessorofPhysicsattheUniversityofOxford;
[originaltext]W:I’veworkedininternationaltradeallmylife.Myfatherdid
[originaltext]M:Tonightwehaveaveryspecialguest.Mrs.AnnaSanchezisat
[originaltext]M:Tonightwehaveaveryspecialguest.Mrs.AnnaSanchezisat
随机试题
TheyweretheMacbethsofinformationtechnology:awickedcouplewhoseized
下列融资方式中,不适用于商业银行在遇到短期资金紧张时获得资金的是()。A.卖出
在一批N个产品中有M个次品,从这批产品中任取n个产品,其中含有m个次品的概率是(
下列组合错误的是A.RMS-颗粒性 B.DQE-噪声等价量子数 C.MTF-
狂犬病的预防措施是A.捕杀野犬、限制养犬、管理家犬 B.不得食用死亡病兽,应将
某医生随机抽取某工厂40名苯作业男工检查,其白细胞均数为5.1×10/L,问苯作
A.子眼B.子眼清楚C.里衣子D.红小辫E.当门子天麻的鉴别特征是
如今,含糖饮料已是人尽皆知,尤其是正在减重的人群,更是对含糖饮料_____。因此
下列关于定金的说法,正确的是()。A.定金合同从实际交付定金之日起生效 B.
根据劳动合同法律制度的规定,关于用人单位直接涉及劳动者切身利益的规章制度的下列表
最新回复
(
0
)