WTF Fun Fact – The Four-Eyed Onesided Fish

The four-eyed fish (Anableps) have eyes raised on top of their head which are divided into two sets of pupils and corneas to see both above and below the waterline. They also mate only on one side, right-“handed” males mate only with left-“handed” females and vice versa. – WTF Fun Facts

Source: https://en.wikipedia.org/wiki/Four-eyed_fish

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