Scientists have discovered how to identify frogs from their tadpoles in a step towards saving amphibians from extinction.

Conservation efforts to protect the breeding grounds of endangered frogs has been hampered by the difficulty of telling tadpoles apart.

Now researchers have solved the puzzle for frogs living in Vietnam’s remote forests.

Their work on Asian horned frogs will help stop amphibians being lost.

Some survive only in small areas of forests which are fast being altered or destroyed.

Benjamin Tapley, curator of reptiles and amphibians at international conservation charity ZSL (Zoological Society of London), said: “These frogs occur in some of the most exploited forests on Earth and are suffering from rapid habitat loss and degradation.”