Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts. All can breathe and absorb water ...

The nearly 41% of endangered amphibian species compares with 27% of mammals, 21% of reptiles and 13% of birds, the study said. "Amphibians are the world's most threatened animals," Duke University ...