Story highlights Tiny frogs don't have webbed feet and sound like insects

They represent an ancient frog genus that dates back 80 million years

(CNN) New species of tiny frogs that can fit comfortably on a coin have been discovered in India.

Seven new species of frog -- some of the smallest in the world -- were found after five years of searching in the Western Ghats, a mountain range in Southwestern India known to be a biodiversity hotspot.

They might have just been discovered but their future is already in doubt, according to Professor SD Biju from the University of Delhi, who led the study.

"Out of the seven new species, five are facing considerable anthropogenic threats and require immediate conservation prioritization," he said in a statement.

The Thumbelinas of the frog world took five years to discover. This is the Robinmoore's Night Frog (Nyctibatrachus robinmoorei) sitting on an Indian five rupee coin.

They sound like insects

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