Scientists have nicknamed this incredible discovery   ‘platypus-zilla’ and it seems to be the largest platypus fossil measuring more than 1 metre long,It indicates there are branches in the platypus family tree that we hadn’t suspected before.”

Tests show the creature would have lived between five and 15 million years ago.

Prof Mike Archer, said: “Suddenly up pops ‘playtpus-zilla’ – this gigantic monstrosity that you would have been afraid to swim with.

Giant platypus

Today, all that survives of this platypus is a single fossilised tooth, which was unearthed in the Riversleigh fossil beds in northwest Queensland.

Giant platypus toothGiant platypus tooth