And in terms of fishes -- fishes appeared 500 million years ago, and they're pretty modern, just 50 million years ago, so -- so interestingly, they give away their ancestry as they develop.
5億年前からいる― 魚類の中で 5千年前に現れたマンボウは かなり近代的な仲間です 面白いことに 成長する過程で祖先の面影が現れます