Kentucky cave shrimp

A shrimp about 1.25 inches long that lives only in the immediate vicinity of Mammoth Cave National Park, in the lowest water-filled passages. It has no eyes and no pigment in its shell, which makes it transparent and very hard to spot. It finds food with its antennules, grazing the microbial films that coat underwater cave surfaces. The cave's streams are fed from the surface, and during floods water flows backwards into the springs, carrying sewage and runoff from farms, parking lots and highways. Pollution is the leading suspect in the shrimp's decline, and it is federally endangered.