It is the greatest mass extinction since the dinosaurs.  Population by population, species by species, amphibians are vanishing off the face of the Earth. Despite international alarm and a decade and a half of scientists scrambling for answers, the steady hemorrhaging of amphibians continues like a leaky faucet that cannot be fixed or a wound that will not heal.  Large scale die-offs of frogs and salamanders around the world have prompted scientists to take desperate measures to try to save those frogs they can.