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
2024-04-05
13
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/3542574.html
相关试题推荐
[originaltext]Mostpeoplehavehadadogorwantedoneastheircompaniona
[originaltext]Mostpeoplehavehadadogorwantedoneastheircompaniona
[originaltext][11]Senatorsarepeoplewhoareelectedevery6yearsandth
[originaltext][11]Senatorsarepeoplewhoareelectedevery6yearsandth
[originaltext]W:Dad,canIgotoamoviewithSharon?M:Yeah,sure,butwait
[originaltext]W:Dad,canIgotoamoviewithSharon?M:Yeah,sure,butwait
[originaltext]M:Hello.W:Hello,Frank.ThisisSusan.I’msorrytophoneyou
[originaltext]M:Hello.W:Hello,Frank.ThisisSusan.I’msorrytophoneyou
[originaltext]M:[23]Somedecadesagomymotherwasreplacedbyacomputer.Her
[originaltext][19]Iamhonoredtobewithyoutodayatyourcommencementf
随机试题
Abovethetreesarethehills,______magnificencetheriverfaithfullyreflects
同一工程中的导线,应根据不同用途选不同颜色加以区分,相同用途的导线颜色应一致。电
我国城镇道路按道路在道路交通网中的地位等分为:()。A.快速路 B.主干路
中国企业M与美国公司L进行技术合作,合同约定M使用一项在有效期内的美国专利,但该
治疗中风后气虚血滞,经络不利之半身不遂,口眼斜者宜选用A.天麻 B.全蝎
刑事处罚中的附加刑包括( )。 A、罚金 B、没收财产 C、驱逐出境
某旅客计划下列旅程:北京——日本东京10月1日出发日本东京——美国
2019年前三季度,我国软件业完成软件业务收入51896亿元,同比增长1
期权交易的最基本策略包括( )。A.买进看涨期权 B.买进看跌期权 C.卖出
支气管扩张症最有意义的体征是A.贫血 B.杵状指 C.消瘦 D.固定的局限
最新回复
(
0
)