First Tool Users Were Sea Scorpions?
第一批使用工具者是海蝎？
Braddy said the sea scorpions also were cannibals that fought and ate one other, so it helped to be as big as they could be.
布拉迪说这种海蝎属于同类相食的物种，它们相互攻击彼此为食，这种争斗促使它们尽可能长得更大些。
Sea scorpions—thought to be among the first marine animals to evolve for life on land—breathed underwater using gills on their tails.
海蝎子被认为是第一批向陆地生活演化的海洋动物中的一种，在水中则用它们尾部的腮呼吸。
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