Pakicetus probably detected sound through the ear opening as in land mammals.
巴基鲸可能是通过像陆地哺乳动物一样的耳朵的开口来探测声音。
Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.
直到最近才发现的化石，显然是介于陆地哺乳动物和鲸类之间的过渡物种。
African elephants are the largest of Earth's land mammals.
非洲象是地球上最大的陆生哺乳动物。
Threatened land mammals are concentrated in south and south-east Asia.
受到威胁的陆地哺乳动物主要集中在亚洲南部和东南亚地区。
In fact, it is said that their fur is the softest out of all land mammals!
事实上，据说其皮毛是所有陆地动物里最柔软的。
Aurochs are the heaviest and the biggest land mammals in all European continent.
欧洲野牛是整个欧洲大陆最大也最重的哺乳动物。
Because of this, these land mammals came to spend more and more time in the water.
由于这一缘故，这些陆地上的哺乳动物便逐渐在水中呆得越来越长了。
Giraffes are the tallest land mammals in the world, with heads that may tower 20 feet above ground.
长颈鹿是世界上最高的陆地哺乳动物，可以高达20英尺。
Most subsequent generations of birds, land mammals, plants, trees and shrubs are matching the vibration of the land at this time.
大多数鸟、陆地哺乳动物、植物、树木和灌木丛的后代，正与此时陆地的振动相匹配。
Polar bears are champion long-distance swimmers among land mammals, and it is not uncommon to find them at sea as far as 50 miles from land or an ice floe.
在陆地哺乳动物中，北极熊无疑是长距离游泳冠军。人们经常在距离陆地或者大块浮冰50英里远的地方看到它们。
大多数哺乳动物生活在陆地上。
Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals.
它们的身体呈流线型，后肢完全消失，身体上长出了尾片和喷水孔，所有这些特征都无法掩饰它们与陆生哺乳动物之间的亲缘关系。
We talk about the age of dinosaurs or the age of mammals, but since the first animal climbed onto land, every age has been, by any reasonable measure, the age of insects too.
我们也许还在津津乐道于恐龙时代或哺乳动物时代，但殊不知第一只动物爬上陆地时，昆虫的时代也已然来临。
Many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.
许多原始生物灭绝，鲨鱼和硬骨鱼成为水域的主人，四足动物最终进化成了恐龙和哺乳动物，征服了陆地。
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that evolved on land should have returned to the sea.
既然海洋中有如此丰富的食物，一些原本在陆地生存的高效率的，适应性强的暖血型动物返回海洋生存是不难理解的。
At sea, as on land, humans have now positioned themselves on the top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea.
在陆地和海洋，人类都已处在巨大的生物金字塔的最顶端，成为所有生物的主宰，并给海洋哺乳动物带来巨大的危胁。
Since there is such an abundance of food in the sea it is understandable that some of the efficient highly adaptable warm-blooded mammals that evolved on land should have returned to the sea.
既然海洋中有如此丰富的食物，一些原本在陆地生存的高效率的、适应性强的暖血型动物返回海洋生存是不难理解的。
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that evolved on land should have returned to the sea.
海洋哺乳动物既然海洋中有如此丰富的食物，一些原本在陆地生存的高效率的，适应性强的暖血型动物返回海洋生存是不难理解的。
Scientists in Canada say a fossil they found helps to understand how seals developed from land-based mammals.
加拿大科学家声称发现一个化石，这有助于帮助揭秘海豹如何从陆地哺乳动物进化而来。
Our fat babies make us unique among land-dwelling mammals.
我们的胖小子，使人类成为陆栖哺乳类中独一无二的物种。
Their streamlined bodies, the absence of hind legs, and the presence of a fluke1 and blowhole2 cannot disguise their affinities with land dwelling mammals.
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。
From land based animals, Marine mammals, and birds, I collect 28 stunning animal images with excellent wildlife photography.
从陆上动物，海洋哺乳动物和鸟类，我搜集优良野生动物摄影28惊人的动物形象。
From land based animals, Marine mammals, and birds, I collect 28 stunning animal images with excellent wildlife photography.
从陆上动物，海洋哺乳动物和鸟类，我搜集优良野生动物摄影28惊人的动物形象。
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