但是鸟类没有血小板，爬行动物和鱼类也没有。
这种复杂动物，包括鱼类、鸟类、爬行动物和哺乳动物(如我们人类)，具有高度细化的免疫系统，这样的系统不会允许这些外来生物体在我们的细胞中生长。
This group of complex animals, which includes fish, birds, reptiles and mammals (like us humans) have highly specialised immune systems, which should not let these foreign organisms live in our cells.
如今，蛇已经与包括鱼类、两栖动物类、爬行动物类、鸟类和哺乳动物类中的不少种类一样，成为一个数量正在急剧下降的动物种类。
Snakes now join a list of declining animal populations that includes fish, amphibians, reptiles, birds, and mammals.
他们也由此认定，大多数动物——哺乳动物，鸟类，爬行动物，两栖动物和鱼类——在春天生育繁殖。因为春季白天开始变长，气温也日渐回升。
That is why, they believe, most animals — mammals, birds, reptiles, amphibians and fish — produce their young and multiply in spring.
这些种群被称为“脊椎动物物种，”即拥有脊椎的动物，像鱼类、鸟类、哺乳动物、两栖动物和爬行动物。
These populations are called "vertebrate species," or animals with backbones — like fish, birds, mammals, amphibians and reptiles.
据报道，这615种新物种包括41种哺乳动物、385种植物、69种两栖动物、61种爬行动物、17种鱼类和42种无脊椎动物。
According to reports, these 615 kinds of new species include 41 mammals, 385 plants, 69 amphibians, 61 reptiles, 17 fish and 42 invertebrates.
该网站简要介绍BBIS，并且提供如下链接：新热带区蝙蝠信息系统，鸟类、哺乳动物类、鱼类、两栖类和爬行动物类的信息。
This web site introduces the BBIS and provides the following links: Neotropical Bat Information System, Birds, Mammals, Fish, Amphibians, Reptiles.
哺乳动物、爬行动物、鸟类、两栖类和鱼类有共同之处——他们都有脊椎，下面介绍每一组的基本特征。
Mammals, reptiles, birds, amphibians and fish all have something in common - they all have a backbone. Here are the basics on each group.
其他的脊椎动物，比如说鱼类，爬行动物和鸟类等红细胞有核的动物的红细胞却没有进化成无核的红细胞。
Other vertebrates such as fish, reptiles and birds have red cells that contain nuclei that are inactive.
每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。
Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.
每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。
Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.
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