Two species of crayfish native to Appalachia are in danger of becoming extinct after years of suffering habitat loss and water quality impacts attributable to mountaintop removal coal mining and other industrial activity. The U.S. Fish and Wildlife Service agency is proposing the species be listed as endangered under federal law. Whether or not they are pushed past the point of no return depends largely on the outcome of a recent proposal by the agency to add them to the federal list of endangered species.