One-third of amphibian species called threatened

The study, a three-year collaborative effort between 500 zoologists, biologists, and wildlife specialists around the world, was organized by three wildlife organizations: NatureServe, Conservation International, and the International Union for the Conservation of Nature. They determined that 32.5 percent of amphibian species were threatened with extinction, compared with 12 percent of birds and 23 percent of mammals.

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