它的头骨也是没有气孔的，这是鲸类动物为潜水而作出的另一适应。
The skull also lacks a blowhole, another cetacean adaptation for diving.
这种鲸保留了尾巴，没有现代水生鲸类动物用于行动的主要部位，尾片。
The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans.
最终，科学家们通过一些非常令人振奋的发现，复原了最接近其原貌的鲸类动物的样子。
Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans.
鲸类动物救人的故事有很多。
有一个显著的例外是鲸类动物，像我们知道的海豚和鲸。
A notable exception are the cetaceans, which we all know as dolphins and whales.
任何人类已知的鲸类动物都因经过日本附近而濒临灭绝。
Every cetacean known to man is endangered just by going anywhere near Japan.
众所周知，鲸类动物是哺乳动物，如鲸鱼、鼠海豚和海豚。
It should be obvious that cetaceans—whales, porpoises, and dolphins—are mammals.
德威森说，“最早的鲸类动物根本不是现在鲸类的样子，而是介于猪和狗之间的样子。”
"Theearliest whales didn't look like whales at all," Thewissen said. "Itlooked like a cross between a pig and a dog."
贝吉海豚。也被称为长江豚，并发现在中国的河流，贝吉海豚是世界上最濒危的鲸类动物，它可能已经灭绝。
Baiji dolphin Also known as the Yangtze dolphin, and found in the river in China, the Baiji is the most endangered cetacean in the world. It may already be extinct.
鲸类动物呈流线型的身体，后腿的消失，尾片和气孔的出现，这些特征都不能掩饰它们和陆生哺乳动物的相似之处。
Their streamlined bodies, the absence of hind legs, and the presence of a fluke1 and blowhole2 cannot disguise their affinities with land dwelling mammals.
许多动物还死于与船只的撞击，还有其他的动物在沙洲被炸毁(为了更方便船只航行)时丧命。沙洲是鲸类动物最喜欢的栖息地。
Many animals also died from run-ins with ships, and others were killed when sandbars-a favorite hangout for cetaceans-were blasted for easier navigation.
日本鲸类动物研究所(Instituteof CetaceanResearch)辩称，根据相关条约规定，资源不能浪费，而且鲸肉的销售收入都投入了研究。
Japan "s Institute of Cetacean research defends this practice under a treaty requirement that resources are not wasted and says income from meat sales goes to research."
棱皮龟没有鲸脂，但它们有和爬行类动物相似的结构：厚且含油的皮肤，下面有一层纤维，再下面是脂肪组织。
Leatherbacks do not have blubber, but they do have a reptilian equivalent: thick, oil-saturated skin, with a layer of fibrous, fatty tissue just beneath it.
这头杀人鲸游过来的时候，这只勇敢的鳍足类动物跳上了座头鲸庞大的肋腹部，躲在它的腋窝下。
As the killer whales moved in, the plucky pinniped leapt on to the vast ribbed belly of a humpback, and nestled in the animal's armpit.
按照我们的分类标准，仅是本世纪的头十年，我们就发现了大约300种哺乳动物新物种——大部分是啮齿类，也有有袋类，突吻鲸类以及大量的灵长类动物。
Even within our own class, mammals, roughly 300 new species have been discovered in the first decade of this century-mostly rodents, but also marsupials, a beaked whale and a slew of primates.
鲸目动物的声音运用能力甚至超过大多数灵长类动物。
她总结说，“灵长类动物和鲸类的大脑的认知能力基本上处在同一是水平，只是进化方式截然不同。”
She concluded, "Essentially, the brains of primates and cetaceans arrived at the same cognitive space while evolving along quite different paths."
鲸不是鱼，而是哺乳类动物。
哲水蚤小海生动物，如哲水蚤属的甲壳类动物，是露脊鲸食物的主要来源。
Minute Marine organisms, such as crustaceans of the genus Calanus, that are a major source of food for right whales.
鲸属于哺乳类动物。
鲸属于哺乳类动物。
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