Play appears to be a developmental characteristic of animals with fairly sophisticated nervous systems, mainly birds and mammals.
玩耍似乎是具有相当复杂的神经系统的动物（主要是鸟类和哺乳动物）的一种发育特征。
Like birds and mammals that eat the fish and insects, and you get trees and plants that begin to grow near the standing water that can't grow near the running water.
就像鸟类和哺乳动物吃鱼和昆虫，你可以看到树木和植物开始在静水附近生长，而不能生长在流动的水附近。
It's now believed yawning operates like a radiator for birds and mammals.
现在他们明白了呵欠对于鸟类和哺乳类来说起到了散热器的作用。
Birds and mammals invest in quality and not quantity, as opposed to fish and reptiles.
鸟类和哺乳类靠质生存,而非以量取胜，这与鱼类和两栖类不同。
To do so, they collected the relevant data for 35 species of long-lived birds and mammals.
为此他们搜集了35种长寿禽类和哺乳类动物的相关数据。
Endotherms are animals such as modern birds and mammals that keep their body temperatures constant.
恒温动物是指诸如现代鸟类和哺乳动物这种可以保持体温恒定的动物。
Besides, the consequences can pass through the food chain and effect other lives such as birds and mammals.
此外，这种后果将透过食物链影响到其他生物，如鸟和哺乳动物。
Previous studies have highlighted the link between larger brains and behavioural innovation in birds and mammals.
以前有研究指出在鸟类及哺乳动物中大脑袋与行为创新性之间存在联系。
Dead fish, birds and mammals coated in oil are washing up on the river Banks, according to environmental officials.
环保官员说，身上沾满原油的死鱼、死鸟和各种哺乳动物被冲上河岸。
Now, many species of formerly endangered birds and mammals, including leopards and pumas, are returning to the region.
现在，许多曾经处于灭绝边缘的物种如鸟类和哺乳动物，包括猎豹和美洲狮，正在陆续回到这一地区。
However, over the years reptiles, birds and mammals lost their electrosense as it wasn’t needed for life on terra firma.
但是，由于在陆地上不需要这样的电子磁场探测系统，爬行类动物，鸟类和哺乳动物都渐渐失去了这一功能。
Researchers now estimate that each year, domestic cats kill billions of birds and mammals in the United States alone.
据研究人员估计，每年被家猫杀死的鸟类和哺乳动物仅在美国就多达数十亿。
Dr Haussler wants to sequence 10,000 vertebrates, a sixth of the total number of species of fish, amphibians, reptiles, birds and mammals.
Haussler博士想测序1万种脊椎动物的基因组，这个数目也即是包括鱼类，两栖类，爬行类，鸟类和哺乳动物等所有物种总数的六分之一。
Biologists from Duke University report that lizards have some of the same creative problem-solving abilities that birds and mammals do.
美国杜克大学的生物学家指出蜥蜴有鸟类和哺乳动物拥有的创造性的解决问题的能力。
This paper reviews the effects of social learning on foraging behavior in herbivorous birds and mammals and the underlying mechanisms.
综述了社群学习对植食性鸟类和哺乳动物觅食行为的作用，并述评了其学习机制。
For birds and mammals, we don't have many kids but so we devote a huge amount of psychological energy to protecting the ones that we have.
鸟类和哺乳类，没有很多孩子，所以我们用大量的心力，去保护我们有的孩子。
Direct human exploitation of organisms, such as through hunting and harvesting, threatens more than a third of the listed birds and mammals.
人类对生物体的直接开发利用，例如狩猎和收获，让三分之一以上列入名录的鸟类和哺乳动物受到威胁。
From a psychological point then, animals have evolved to be nice to their kin, particularly their children, and particularly in birds and mammals.
从心理学角度看，动物进化趋向于对自己的亲人有益，特别是自己的孩子，以鸟类和哺乳类为代表。
Many dinosaur track - ways show that dinosaurs walked as fast as do birds and mammals, and much more rapidly than can be sustained by reptiles.
许多恐龙的足迹显示它们的行动与鸟类和哺乳动物一样快，比一般的爬行类要快得多。
"If we only study birds and mammals, we're only going to learn from those groups," he said. "This is one more distinct group we need to learn about."
“如果我们只研究鸟类和哺乳动物，那么我们只能从这两类动物中得到信息，”他说，“爬行动物是我们应该研究的另一个独特类别。”
The researchers found that the brains of birds and mammals do have different structures. But there are also similarities in the brain architecture.
研究人员发现，鸟类和哺乳动物确实有着不同的大脑组织。但是在大脑结构上有相似之处。
Chorion: the outer membrane enclosing the embryo in reptiles birds and mammals. in placental mammals it contributes to the development of the placenta.
绒毛膜：在爬行类动物，鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。
Chorion: the outer membrane enclosing the embryo in reptiles birds and mammals. in placental mammals it contributes to the development of the placenta.
绒毛膜：在爬行类动物、鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。
Avian influenza virus can cause serious disease in a wide variety of birds and mammals, but generally its natural host range is limited to wild ducks and gulls.
禽流感病毒可感染许多鸟类和哺乳动物，但是其自然宿主范围通常限于野生水禽，如野鸭、海鸥等。
The findings are at odds with research from the National University of Singapore last month, which found birds and mammals are shrinking because of global warming.
这些结果与上个月新加坡国立大学的研究结果相左，那个研究发现因为全球变暖，鸟类和哺乳动物都在缩小。
Biologists have found a new way to peer back 130 million years in time, illuminating the catastrophic period in which the dinosaurs perished and birds and mammals arose.
生物学家找到了一种观察到1亿3千万年前的历史的方法，让我们去了解恐龙灭绝而鸟类和哺乳动物繁荣起来的那段充满灾难的时期。
"They will eat almost every vertebrate of the right size, but they mostly prefer birds and mammals," said USGS biologist Gordon Rodda, who co-authored the 350-page study.
“它们几乎会吃大小适中的每一类脊椎动物，但它们更偏爱吃禽类和哺乳动物。”曾合作撰写了350页研究报告的美国地质勘探局生物学家戈登·瑞达说。
The paper summarizes the toxic effects of lindane on birds and mammals, as well as poisoning signs and some effect mechanism, on basis of tests in vitro and in vivo.
本文通过一些典型动物试验和离体培养试验，介绍了林丹对鸟类和哺乳类动物的毒性、中毒特征和某些作用机制。
The paper summarizes the toxic effects of lindane on birds and mammals, as well as poisoning signs and some effect mechanism, on basis of tests in vitro and in vivo.
本文通过一些典型动物试验和离体培养试验，介绍了林丹对鸟类和哺乳类动物的毒性、中毒特征和某些作用机制。
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