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Have any animals evolved an odd number of eyes?

Question #129703. Asked by bszpak.
Last updated Apr 07 2023.
Originally posted Feb 25 2013 2:59 AM.

Answer has 2 votes
15 year member
269 replies

Answer has 2 votes.
Starfish have an eye at the end of each leg. A five legged starfish will have five eyes. They can have as many as twenty legs, each with its own eye.


We can add a few more to the list. There long extinct ancestors of fish that had a third eye. A remnant of this eye can be found in some lizards, tadpoles and other amphibians. Many species of jellyfish and shellfish have a great many eyes. Some of them will be an odd number I'm sure. no longer exists

A small crustacean commonly called a "tadpole" or "tadpole shrimp" has three eyes. It's scientific name is triops-cancriformis. Triops means "three eyes".


Response last updated by gtho4 on Apr 07 2023.
Feb 25 2013, 4:45 AM
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