你会想到一群色彩斑斓的野生动物：鹦鹉的彩虹羽毛或海鱼的艳丽鳞片。
A group of colorful wild animals will spring to mind: a parrot's rainbow feathers or the showy scales of sea fish.
你在哺乳动物身上找不到羽毛，在灵长类动物身上找不到腮。
You won't ever find feathers on a mammal or gills on a primate.
直到最近在分类学上，鸟的定义是一只有羽毛的动物。
Taxonomically, the very definition of a bird was until recently an animal that has feathers.
他补充道，远古时期的羽毛并不用于飞翔，而是起到与其他动物沟通、求偶及取暖的作用。
He added that, since these ancient feathers didn't aid flight, they likely served for purposes of animal communication, mating, and warmth.
信号在动物世界中也同样流行，比如说孔雀的羽毛，麋鹿的打斗等等。
Signaling is also rampant in the animal world, from peacock feathers to elk battles and the subject of a vibrant and related research program.
像伶盗龙(velociraptor)这类一般被视为恐龙的小型动物其实更像没有羽毛的鸟类，他说。
Small animals such as velociraptor that have generally been thought to be dinosaurs are more likely flightless birds, he said.
但是翼膀和肢臂处翼尖黑色的白羽毛可能能够帮助赫氏近鸟逃脱肉食动物的掠捕。
But white and black limb feathers might have helped Anchiornis escape predators.
中国东北发现的化石表明，有羽毛的动物很显然并不会飞行，同样那些看起来和鸟一模一样的动物也不会飞。
Fossils from north-eastern China show animals that had feathers but clearly could not have flown, as well as ones that look like proper birds.
始祖鸟拥有羽毛，它身上既有现代鸟类的特征，也有远古爬行动物的痕迹，例如口中有牙齿，翅膀上有爪子，还有一条硕长的骨质尾巴。
It had feathers and other traits of living birds but also vestiges of a reptilian past, such as teeth in its mouth, claws on its wings, and a long, bony tail.
幼狼还喜欢玩“玩具”，骨头啊，羽毛啊，或者死动物的皮。
Pups will also play with "toys" like bones, feathers or the skins of dead animals.
最原始的羽毛是单纤维，类似于刚毛，从爬行动物的皮肤上突出来。
Feathers in their most primitive form were single filaments, resembling quills, that jutted from reptilian skin.
在鸟类中也有同样的肌肉，在冬天它使得鸟的羽毛膨胀，以达到御寒的目的。哺乳动物也通过毛发来御寒。
The same muscles puff up the feathers of birds and the fur of mammals on cold days to help keep them warm.
就在同时，其他科学家们开始通过检验现代爬行动物的鳞片来试图阐明羽毛的起源，因为爬行动物与鸟类之间的亲缘关系最为接近。
In the meantime, other scientists sought to illuminate the origin of feathers by examining the scales of modern reptiles, the closest living relatives of birds. Both scales and feathers are flat.
就在同时，其他科学家们开始通过检验现代爬行动物的鳞片来试图阐明羽毛的起源，因为爬行动物与鸟类之间的亲缘关系最为接近。
In the meantime, other scientists sought to illuminate the origin of feathers by examining the scales of modern reptiles, the closest living relatives of birds.
BMP12是一组控制哺乳动物毛发和鸟类羽毛密度的蛋白质，它的主要作用是减缓羽毛的生长。
BMP12 is one of a group of proteins that control the density of hair in mammals and feathers in birds. In the case of BMP12, it slows down the growth of such features.
对此最好的猜测便是，羽毛的出现要么是为了护身(就像哺乳动物的毛皮)，要么就是为了作秀；此外，自然选择就择优而把某些动物的羽毛变成了它们的交通工具。
The best guesses are that feathers evolved either for insulation (as fur did in mammals) or for display, and that natural selection took advantage by turning them into a means of transport.
罗伯特·波义尔就是其中之一，他提出一个问题“受体动物的毛发或羽毛……是否会变成供血动物的颜色呢？”
Robert Boyle, for one, voiced the question of "Whether the colour of the hair or feathers of the recipient animal... will be changed into that of the emittent?"
后来，人们将动物的皮缝合起来，里面塞进羽毛或干草做成球。
Later they were made of pieces of animal skin sewed together and stuffed with feathers or hay.
因为鸟类羽毛和爬行动物的鳞片都包含黑素体——这是一种微小的囊状结构，其中包含了各种各样的黑色素，于是很多古生物学家开始怀疑恐龙羽毛是否也含有黑素体。
Bird feathers and reptile scales contain melanosomes-tiny sacs holding varieties of the pigment melanin. Many paleontologists suspected that dinosaur feathers also contained melanosomes.
动物被杀害的毛皮和羽毛，食物，运动，仅仅因为他们的方式。
Animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way.
重现整理羽毛介导的禽流感病毒传播机制的动物模型研究正在进行中。
Studies to reproduce the preening-mediated AIV infection mechanism in the animal model are in progress.
鸟- - - - -一种动物长有翅膀并且浑身被羽毛覆盖，而且会飞。
"Bird" — a creature with wings and feathers that can usually fly.
生长第一和第二阶段的羽毛，保温用，汉堡大学动物学会和动物博物馆。
Body feathers, first and second stage, insulation, Institute of Zoology and Zoological Museum, University of Hamburg.
从历史文献和考古发现说明山羊绒、牦牛毛、骆驼毛、兔毛以及羽毛等特种动物纤维在我国古代纺织品中的应用。
The utilization of special animal fibers including cashmere, yak hair, camel hair, rabbit hair and feathers is illustrated by literature and the archaeological discoveries.
雅利安的遗传工作的进行和开发是用来去除附肢，爪子，羽毛和类似爬虫动物的皮肤及鳞片。
The genetic work had been processed and developed on Aryan and was used to remove appendages, claws, feathers and reptilian skins and scales.
动物被杀害的毛皮和羽毛食物运动仅仅因为他们的方式。
Animals have been killed for their fur and feathers for food for sport and simply because they were in the way.
斯塔岛区的动物控制中心的官员称，孔雀被殴打至尾部羽毛基本脱落，严重受伤，只能实行安乐死。
Animal control officials in Staten Island say the bird was beaten so fiercely that most of its tail feathers fell out and it had to be euthanized.
中国的古生物学家认为，这种新发现的恐龙-二连巨盗龙，可能是至今发现的最大羽毛动物，对较小的恐龙形成威胁。
The newly discovered dino, shown looming over much smaller dinosaurs-probably represents the largest feathered animal ever known, Chinese paleontologists say.
中国的古生物学家认为，这种新发现的恐龙-二连巨盗龙，可能是至今发现的最大羽毛动物，对较小的恐龙形成威胁。
The newly discovered dino, shown looming over much smaller dinosaurs-probably represents the largest feathered animal ever known, Chinese paleontologists say.
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