巨型不飞鸟是“温和的食草动物”
文章来源:未知 文章作者:enread 发布时间:2012-11-23 08:07 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
Footprints believed to have been made by the giant bird Diatryma indicate that it was a "gentle herbivore" and not a fierce carnivore, scientists say.

科学家称,巨型不飞鸟留下的脚印显示这种鸟是“温和的食草动物”,并非凶残的食肉动物。
The giant flightless Diatryma: unequipped to be a carnivore?
The giant flightless Diatryma: unequipped to be a carnivore?
 
A team of researchers from Washington, US, examined tracks uncovered in a landslide1 in 2009.
 
Previous investigations2 have suggested the giant bird was a carnivorous predator3 or scavenger4(食腐动物).
 
But the absence of raptor-like claws in the footprints supports the theory that Diatryma was not a meat-eater.
 
Measuring 7ft (2.13m) tall and with a huge head and beak5, the giant flightless bird Diatryma (believed by some experts to belong to the genus Gastornis) is commonly portrayed6 as a fierce predator in both scientific works and popular media.
 
The animal is frequently thought as "the bird that replaced dinosaurs7 as the top predator", said geologist8 and team member George Mustoe, from Western Washington University in Bellingham, US.
 
"Let's be honest: scary, fierce meat-eaters attract a lot more attention than gentle herbivores."
 
The study, published in the journal Paleontology, analysed a set of footprints made 55.8 to 48.6 million years ago in the Lower Eocene. Preserved in sandstone, the prints formed part of the Chuckanut Formation in northwest Washington, US.
 
The team concluded that the multiple, well-preserved tracks were most likely to have been made by Diatryma.
 
That would make them the only known footprints left behind by this giant bird, and they provide new evidence about what it ate.
 
"[The tracks] clearly show that the animals did not have long talons9, but rather short toenails(脚趾甲)," said David Tucker, from Western Washington University, who also worked on the study.
 
"This argues against an animal that catches prey10 and uses claws to hold it down. Carnivorous birds all have sharp, long talons."


点击收听单词发音收听单词发音  

1 landslide XxyyG     
n.(竞选中)压倒多数的选票;一面倒的胜利
参考例句:
  • Our candidate is predicated to win by a landslide.我们的候选人被预言将以绝对优势取胜。
  • An electoral landslide put the Labour Party into power in 1945.1945年工党以压倒多数的胜利当选执政。
2 investigations 02de25420938593f7db7bd4052010b32     
(正式的)调查( investigation的名词复数 ); 侦查; 科学研究; 学术研究
参考例句:
  • His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查,但没有发现什么。
  • He often sent them out to make investigations. 他常常派他们出去作调查。
3 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
4 scavenger LDTyN     
n.以腐尸为食的动物,清扫工
参考例句:
  • He's just fit for a job as scavenger.他只配当个清道夫。
  • He is not a scavenger nor just a moving appetite as some sharks are.它不是食腐动物,也不像有些鲨鱼那样,只知道游来游去满足食欲。
5 beak 8y1zGA     
n.鸟嘴,茶壶嘴,钩形鼻
参考例句:
  • The bird had a worm in its beak.鸟儿嘴里叼着一条虫。
  • This bird employs its beak as a weapon.这种鸟用嘴作武器。
6 portrayed a75f5b1487928c9f7f165b2773c13036     
v.画像( portray的过去式和过去分词 );描述;描绘;描画
参考例句:
  • Throughout the trial, he portrayed himself as the victim. 在审讯过程中,他始终把自己说成是受害者。
  • The author portrayed his father as a vicious drunkard. 作者把他父亲描绘成一个可恶的酒鬼。 来自《现代汉英综合大词典》
7 dinosaurs 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西
参考例句:
  • The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
8 geologist ygIx7     
n.地质学家
参考例句:
  • The geologist found many uncovered fossils in the valley.在那山谷里,地质学家发现了许多裸露的化石。
  • He was a geologist,rated by his cronies as the best in the business.他是一位地质学家,被他的老朋友们看做是这门行当中最好的一位。
9 talons 322566a2ccb8410b21604b31bc6569ac     
n.(尤指猛禽的)爪( talon的名词复数 );(如爪般的)手指;爪状物;锁簧尖状突出部
参考例句:
  • The fingers were curved like talons, but they closed on empty air. 他的指头弯得像鹰爪一样,可是抓了个空。 来自英汉文学 - 热爱生命
  • The tiger has a pair of talons. 老虎有一对利爪。 来自辞典例句
10 prey g1czH     
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
参考例句:
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
TAG标签: giant bird footprints
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片