Dyeing Poison Dart frogs at the National Zoo in Washington. Scientists say frog species are in danger from the spread of a chytrid fungus that is killing amphibians at an alarming rate. Picture: Associated Press.

The new species "boophis aff elenae" is seen in this undated picture released by the Spanish Scientific Research Council (CSIC). Scientists have found more than 200 new species of frogs in Madagascar. Picture: Reuters.

A frog of the new species "guibemantis liber" is seen in this undated picture released by the Spanish Scientific Research Council (CSIC). Picture: Reuters.

A White's Tree Frog perches on the hand of biologist Matt Evans, at the National Zoo in Washington. This frog's skin produces a peptide that can help deter HIV. Picture: Associated Press.