Devils Hole pupfish: rarest fish on Earth lives in one Nevada cavern

This video shows the weirdness of the Devils Hole pupfish. Deep inside a single limestone cavern in Nevada’s Mojave Desert lives one of the rarest fish on Earth. The tiny, shimmering blue fish can be found in only one known natural habitat in the world: a water-filled limestone fissure called Devils Hole. That’s the only place on the planet where they l…