Why is there no large animal with more than 2 eyes but spiders have a lot of eyes?
In: Biology
[But there are!](https://en.wikipedia.org/wiki/Parietal_eye)
It’s not the kind of eye that you were imagining, but many currently living species (reptiles, frogs, and more) have ‘primitive’ eyes on top of their heads. Our common ancestor with those species also had the eye, but mammals and birds have lost it.
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