本書講的，是關於太古時代，幾千萬年前，地球上曾經有過的各種動物的故事。這些太古時期曾經生存過的動物，有的絕種了，有的進化了。他們的骨骼留在地層裏，變成了化石。依靠化石的發掘和整理，我們可以了解古代的地殼上，曾經有過什麼樣子的動物在爬走和飛翔。本書談到了恐龍、三葉蟲、原始魚、始祖鳥、像狐狸一樣小的原始馬等等動物，讀者可以從這裏得到關於古代生物的一般知識。
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