Furthermore, cave crayfish also feed on Alabama cavefish. For example, the Mexican tetra is an albino cavefish that lost its eyesight during evolution. Finally, the same type of experiment in the cavefish "Astyanax mexicanus" yielded similar results. Among the endemic, the cave-dwelling Somali blind barb and the Somali cavefish can be found. The Ozark cavefish, a U.S. federally listed species, also consumes guano. Typical adaptations found in cavefish are reduced eyes and pigmentation. The Tocantins basin, arguably not part of the Amazon basin, has several other cavefish species. Key Cave is the critical habitat of the Alabama cavefish. The park's blue holes contain various unique cavefish and invertebrates. New cavefish species are described with some regularity and undescribed species are known. Many adaptions seen in cavefish are aimed at surviving in a habitat with little food. It is the only known cavefish in mainland Southern Africa. The Alabama cavefish is one of the rarest cavefish species in North America. Little is known of the reproductive habits and life history of the Alabama cavefish.