Groundhogs are large animals that live under ground.

土拨鼠是生活在地下的大型动物。

First, such large animals are expensive to keep.

首先，这样的大型动物饲养成本很高。

Elephants are the largest living land animals.

大象是最大的陆生动物。

This is actually the largest animal migration on earth.

这事实上是地球上最大的动物迁徙。

Blue whales are the largest animals to ever live.

蓝鲸是有史以来最大的动物。

The chemical kills insects but also harms larger animals.

这种化学物质会杀死昆虫，但也会伤害较大的动物。

They're one of the largest animals in the oceans.

它们是海洋中最大的动物之一。

It's a very large animal and usually lives alone.

这是种大型动物，通常独自栖息。

They were the Earth's largest animals, the ultimate predators.

它们曾是地球上最大的动物，终极掠食者。

It's the world's largest burrowing animal.

土豚是世界上体形最大的穴居动物。

Do you know what the largest animal in the world is?

你知道世界上最大的动物是什么吗？

Blue whales are the largest animals ever to exist on Earth.

蓝鲸是地球上有史以来存在过的最大动物。

Seems that larger animals have a longer urethra, the conduit that whisks the wee-wee away.

大型动物虽然看起来尿道更长，但导管结构使得排尿过程很快。

The American buffalo is one of the largest land animals in North America.

美洲野牛是北美陆地上体型最大的动物之一。

But they are the main source of food for larger animals, like whales.

但它们却是鲸鱼等大型动物的主要食物来源。

For thousands of years these large white animals have been walking the same path.

几千年来，这些大型白色动物一直在同样的路上行走。

At that time there were no large animals, just creatures like snails and worms.

当时还没有巨型动物，只有蜗牛和虫这样的生物。

Black bears feed on leaves, herbs. Fruit, berries, insects, fish, and even larger animals.

黑熊以树叶、草、树根、水果、浆果、昆虫、鱼，甚至更大的动物为食。

When people arrived in Australia about 50,000 years ago, large animal population losses followed.

大约5万年前，当人们到达澳大利亚时，随之而来的是大量动物数量的减少。

The population of these extremely large sea animals has decreased sharply in recent years.

近年来，这些巨型海洋动物的数量急剧减少。