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
2024-03-12
6
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://www.tihaiku.com/zcyy/3526735.html
相关试题推荐
[originaltext]Objectsthatarevibratingmakesounds.Rhythmicsoundvibrations
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-and-th
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-and-th
[originaltext]Easterisamixofthreetraditions:Pagan,HebrewandChristian.
[originaltext]W:2millionhighschoolseniorsaregearingupthisfalltoappl
随机试题
PreventingCrossCulturalMiscommunicationMiscommunicationshappenallthetime
Thereceiverofthisletteris______.[br]GeorgeChenshouldgobacktoassess
土压式盾构在软弱或松散地层掘进时,盾构外围与周围土体的黏滞阻力或摩擦力较大时,应
渗透变形的破坏形式有()。A.流土 B.管涌 C.接触冲刷 D.接触流
下列有关急性淋巴细胞白血病的叙述,错误的是A:原始及幼稚淋巴细胞在造血组织中异常
其作用与肾上腺皮质功能有关的利尿药是A.呋塞米 B.螺内酯 C.依地尿酸
(2015年11月)人员配置应遵循的原则不包括()。A.岗得其人 B.人得其
共用题干2009年,某期货交易所的手续费收入为5000万元人民币,根据《期货交易
循环骤停的临界时间是A.1min B.2min C.4min D.8min
判断心脏骤停迅速简便的方法是A.触摸大动脉搏动是否存在 B.测量有无血压 C
最新回复
(
0
)