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.
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 includes keeping them in more suitable cages, allowing social animals like dogs to live together and trying to reduce the boredom that these animals can experience.
这包括把它们豢养在更符合要求的笼子里，允许像狗这样的群居性动物能生活在一起，并且努力降低这些动物生活的单调枯燥程度。
The animal life here is varied and includes many strange animals that do not live elsewhere.
这里的动物品种甚多，其中有些是别处没有的奇怪动物。
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