The Appalachian region of the eastern United States is the world's epicenter for salamander biodiversity. These secretive creatures, ranging in size from two inches to more than two feet, are a keystone species at risk from a perfect storm of threats, including: development, mountaintop mining, climate change, invasive species, disease, transportation corridors, acid rain, pollution, and more. Learn what these declining "canaries in the coal mine" are telling us about the state of our environment.