科学美国人60秒|慈鲷科鱼拥有非同寻常的视觉系统

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 【新朋友】 点击标题下面蓝字 【 可可英语 】 加关注 【老朋友】 点击手机右上角图标 【 转发分享 】 内容 【听音频，也可猛戳左下角“ 阅读原文 ”】 This is Scientific American — 60-Second Science. I'm Jason Goldman. Got a minute? Hundreds of millions of years ago a humble fish swam in the lakes and rivers of the supercontinent Gondwana. Eventually Gondwana broke apart, becoming the continents we know today. And the descendants of that fish, now called cichlids, continue to swim the fresh waters of both Africa and South America. Cichlids have some of the most incredible visual systems known. Humans have genes that code for three different types of visual pigments, called opsins. Cichlids have seven. "But what is interesting within cichlids, which is this group of ………………………………