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Contact: Kelly Blake
University of Maryland

Eyed and Eyeless Astyanax mexicanus

Caption: Except for the loss of eyes and pigment seen in the cave-dwelling form, the surface-dwelling (at top) and cave-dwelling fish (at bottom) are hard to tell apart. You can study evolution very nicely if you have both the ancestral and derived forms of evolving animals.

Credit: Masato Yoshizawa

Usage Restrictions: Credit: University of Maryland, Masato Yoshizawa.

Related news release: Adapting to darkness: How behavioral and genetic changes helped cavefish survive extreme environment

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