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
15
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 can use their claws as tools.
B、They have straight beaks.
C、Their claws are like human thumbs.
D、Their beaks are short but hard.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3542575.html
相关试题推荐
[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]W:Dad,canIgotoamoviewithSharon?M:Yeah,sure,butwait
[originaltext]M:Hello.W:Hello,Frank.ThisisSusan.I’msorrytophoneyou
[originaltext][19]Iamhonoredtobewithyoutodayatyourcommencementf
[originaltext][19]Iamhonoredtobewithyoutodayatyourcommencementf
[originaltext][19]Iamhonoredtobewithyoutodayatyourcommencementf
随机试题
Whathaveyoutodobeforeyougettothedeparturegate?Youhavetopay___
图像image
[originaltext]W:Ihaven’thadmuchexerciselately.Myonlyrecreationhasbee
[originaltext]We’velongbeentoldthatanappleadaykeepsthedoctorawa
WarrenBuffett,whowillhostBerkshireH
Keller-Kiliani反应中强心苷溶于冰醋酸,冰醋酸中应含有A.FeB.C
在行政诉讼中对具体行政行为的合法性负有举证责任的是:()A.原告 B.被告
过程分析的方法包括()。 A.技术分析方法B.过程质量特性变化的分析 C
下列关于买断式回购业务履约金归属判定规则的说法,正确的有()。A:融资方履约,融
"人类的生命和健康是上帝神灵所赐,疾病和灾祸是天谴神罚",指导产生这种认识的医学
最新回复
(
0
)