Herpetologists have paralleled amphibians to the proverbial canary in the coalmine. Amphibians are natural indicators of our planet's well-being. They alert us of its condition. Because frogs and toads lead a double life, meaning both terrestrial and aquatic, they are twice as likely as other vertebrates to be effected by their environment. What makes frogs such important bioindicators is their permeable skin, which makes them highly vulnerable to toxins and threats present in the water, on land, and in the atmosphere.
More research needs to be done and more factors investigated.
Perhaps some of the more recent research will reveal some answers . Comprehensive information about amphibians. Vanishing Wildlife in North America. National Geographic Society. Ultraviolet light and Amphibian Declines.