人类生活的这个蔚蓝色的星球是生机盎然、充满活力的，在这个星球上，除了最高级的灵长类——人类以外，还有许多动物伙伴，让这个原本安静的星球变得热闹起来。在生物界，动物是这生态平衡中必不可少的一部分。你是一个动物迷吗？《青少年动物常识必读》为大家介绍了"动物常识概述"、"动物界有多少种动物"、"腔肠动物的特征"等等，快来看看吧！
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