Giant toothed platypus roamed Australia

A giant platypus with powerful teeth roamed the rivers of northern Australia between 5 and 15 million years ago.  Dubbed 'Platypus Godzilla', the creature was twice the size of a modern platypus and had teeth to chew crayfish, frogs and small turtles.  Palaeontologists say the fossil is forcing a re-think about the evolution of the species, and warn it could indicate the smaller modern platypus is on track to extinction.