Scientists believe newly discovered demon cavefish may be among the rarest fish in the world

By Sneha Dhandapani, CNN Bobcat Cave near Huntsville is home to the endangered Alabama cave shrimp, two species of cave crayfish and the southern cavefish. Those were all Dr. Matthew Niemiller expected to find when he set out to survey the cave system last year. Instead, he discovered a bizarre-looking fish, previously unknown to science.