During the Cambrian Period, many major animal groups first appeared on Earth.

寒武纪时期，地球上首次出现许多主要的生物群。

Simbakubwa was a member of an animal group that appeared 62 million years ago.

非洲巨狮是6200万年前的一类物种。

Simbakubwa was a member of a animal group that appeared 62 million years ago.

Simbakubwa是6200万年前出现的哺乳动物群体中的一种动物。

They said it is related to the animal group that includes corals, jellyfish, and anemones.

他们说，它与包括珊瑚、水母和海葵在内的动物群体有关。

The term pod can be used to describe all of these animal groups except, Sharks, Walruses, Pelicans or Whales.

英语中“pod”这个词不能用来描述鲨鱼、海象、鹈鹕或鲸鱼中的哪种动物群体。

Within about 20 million years, life had branched out to include most of the animal groups we know today.

在两千万年内，生命演化并分支，发展出了现今已知的大多数动物类别。

The expression comes from the vocabulary that we use in describing animal groups.

这个表达来自我们用来描述动物群体的词汇。

Four different experiments were performed with varying degrees of communication between the animal groups.

进行了四个不同的实验，动物组之间的交流程度不同。

Though much remains unknown, some researchers suspect that parasitoid wasps are among the most diverse animal groups — perhaps the most diverse.

虽然未解之谜有很多，但是有些研究者怀疑拟寄生黄蜂是最多样化的动物种群之一，也有可能就是最多样化的那一个。

In fact, their fossilized conga lines represent some of the first evidence of animal group behaviour.

事实上，他们的康茄线化石代表了动物群体行为的一些最初证据。

He told the Associated Press it is believed that " … modern animal groups like jellyfish appeared 540 million years ago in the Cambrian explosion."

他告诉美联社，据信“… … 诸如水母之类的现代动物群体出现在5。4亿年前的寒武纪大爆发期间。”

He told Reuters that the study should open the door to new research about how growth rates are connected to the size of many different animal groups.

他告诉路透社，这项研究应该会为新的研究打开大门，新研究将研究许多不同动物群体的生长速度与体型有怎样的联系。

Within all but one of the major animal groups these authors looked at, they found that small species are way more diverse than large ones.

在这些作者研究的主要动物群中， 除了一个以外，他们发现小型物种比大型物种更加多样化。

" Natural selection" is when certain members of a plant or an animal group have small genetic changes, and these changes are beneficial to them.

“自然选择”是指植物或动物群体的某些成员发生微小的遗传变化，而这些变化对它们有利。

It saw the rise and spread of the  first of the major animal groups that were, well, recognizable as animals - with  body plans that resemble modern groups today.

它见证了第一个主要动物群体的兴起和传播，这些动物群体被认为是动物，其身体结构与今天的现代群体相似。

Bats comprise roughly one-fifth of all mammal species in Madagascar and thirty-six recorded bat species are native to the island, making it one of the most important regions for conservation of this animal group anywhere in the world.

蝙蝠约占马达加斯加所有哺乳动物物种的五分之一， 有 36 种记录在案的蝙蝠物种原产于该岛，使其成为世界上保护该动物群最重要的地区之一。