One third of amphibians globally are threatened with extinction.
In the last 20 years scientists all over the world have been finding dead frogs in zoos, private collections and in the wild.
Many species have completely disappeared and others are close to extinction. Scientists believe they know what's responsible, a waterborne fungus called chytrid.
But why has it started to kill frogs only recently and what is it about amphibians that makes them so susceptible?
Sue Broom travels to Sardinia to meet the people who are part of a global effort to tackle the mass extinction.
Are their local populations threatened? And what does this means for species world wide?
Listen to the programme
First broadcast 8th July 2008
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