The bodies of Alabama cavefish allow them to survive without vision via elaborate appendages and beefed-up nerve centers.

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"Instead of vision, many [troglobites] have elaborate appendages and beefed-up nerve centers to interpret slight air-pressure or temperature changes, sounds, and smells. This sensory equipment lets them travel, sense objects moving or still, ambush prey, and according to a recent study of troglobitic fish, judge the size and suitability of prospective mates, sight unseen." (Krajick 2007:139)

Journal article
Discoveries in the DarkKevin Krajick

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