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Duration:	12:25
Uploaded:	2025-11-03
Last sync:	2025-11-03 17:15

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The Mexican tetra, lives in freshwater streams and pools from Mexico up into the southern United States. But these fish also live in cave systems in at least 29 separate places in Mexico, where they have no pigment, and anywhere from minimal eye function to virtually no eyes at all.



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Sources:

https://www.science.org/doi/10.1126/science.ady4515

https://www.nps.gov/cabr/blogs/excuse-me-what-do-you-keep-in-your-gular-pouch.htm

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https://www.science.org/doi/abs/10.1126/science.289.5479.631

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Images:

https://docs.google.com/document/d/1O1FBe1I6xGiA_Gcuh8ZPFOXi_ecdQNblqzEhWUTWp0w/edit?usp=sharing