By contrast, "Land animals-like ourselves-are always working to keep themselves upright and keep their shape," Mouritsen says, so our muscle fibers are thicker, tougher and firmer.

This applies not only to aquatic and land animals, but also to plant species, whether domesticated and not.

这不仅可适用于水生和陆生动物，还可适用于植物，而不论是否是驯养的。

The largest land animals on Earth.

它们是地球上最大的陆生动物。

INSECTS communicate not only between species but with subterranean and land animals and use plants like a telephone line to exchange information.

各种昆虫能相互沟通，和地下及陆上的动物也能透过动物像通电话般进行交换。

Its forbidding climate and wild seas prevented the migration and development of land animals such as the Arctic regions know.

和人们已熟知的北极区域一样，它那令人难以亲近的气候和狂野的海浪使得陆地动物无法迁移至此和繁衍。

Now then, the sea is precisely their best medium, the only setting suitable for the breeding and growing of such giants--next to which such land animals as elephants or rhinoceroses are mere dwarves.

而海洋正是这些幻想的最好泉源，因为只有海才是巨大动物可以繁殖和成长的环境，陆上的动物，大象或犀牛之类。跟它们比较起来，简直渺小得很。

Fish muscle is very different than that in land animals.

鱼类的肌肉和陆地动物的肌肉有很大不同。

These more metabolically active reptiles, which could survive the harsh interior regions of Pangaea, became the dominant land animals of the late Permian.

这些新陈代谢更活跃的爬行类，能够熬过盘古大陆上的恶劣环境并成了后期二叠纪上的霸主。

Geologists have found that plankton and molluscs were wiped out in vast numbers and that land animals and plants were also affected.

地质学家们发现，当时浮游生物和软体动物大量消失，陆生动植物也受到了影响。

In each of the others up to half of all land animals and up to 95 percent of marine species disappeared.

每次物种灭绝，都有半数甚至95%的海洋生物彻底消失。

They also have a greater capacity than land animals to store oxygen in their blood.

它们在血内储氧的能力比陆生动物高出许多。

The Triassic period ended 210m years ago with another mass extinction of sea creatures, and some land animals as well.

2.1亿年前三叠纪末期，大批海洋生物和部分陆地动物灭绝；

Nor I, sir, Captain Nemo answered me. I never touch the flesh of land animals.

先生，尼摩船长回答，我从来也不吃陆上动物的肉。

But scientists have now discovered the largest living land animals have personalities to match their size.

但是科学家现在发现，这种现存最大陆生动物身材不同，性格也不同。

Formerly, in prehistoric days, land animals were built on a gigantic scale.

从前，跟地质学纪年同时代的陆上动物，四足兽，四手兽，爬虫类，鸟类，都是按照巨大的模型创造的。

and the largest land animals in North America.

是北美洲最大的陆生动物

This includes 30,000 species of land animals-including humans-and a similar number of ray-finned fish, the scientists found.

科学家们发现这些动物包括3万种陆地动物，和一小部分鳍刺类鱼。

Over many years, cheetahs have evolved into becoming the earth's fastest land animals through a series of adaptations.

经过数万年时间的积累，猎豹不断适应环境，逐渐成为地球上运动最快的陆地动物。

In the early going, scientists placed a mirror on the ground outside the elephant's cage, but the mirror was ( unsurprisingly) much smaller than the largest of land animals.

在早期的实验中，科研人员在象笼外的地面上放了一面镜子，但是这面镜子（毫不意外地）比这个陆地上的最大动物要小得多。

Humans can recognize emotions across all vocalizing land animals, researchers have found.

研究人员近日发现，人类可以识别所有可发声陆地动物的情感。

The aggregate motion of a flock of birds, a herd of land animals, or a school of fish is a beautiful and familiar part of the natural world.

鸟群、鱼群和人群等集群运动是自然界最美丽也最常见的景象之一。