University of Newcastle researchers have developed a method to freeze frog embryonic cells in a world-first breakthrough which could be used to slow the threat of extinction faced by hundreds of frog species.

Frogs are said to have the worst rate of extinction of any vertebrate group, with 200 species lost in the past thirty years and another 200 species facing extinction.

The technique will be used to buy time for the frogs while researchers look for answers to diseases and other threats.