The rat that's the size of a cat: BBC team discovers 40 new species in 'lost world'

Rats as big as cats, fanged frogs and grunting fish - they sound like something from a horror movie. But, incredibly, there is a 'lost world' on a distant island where these nightmarish creatures really exist. A team of scientists discovered the bizarre animals - and dozens of others - at a remote volcano in Papua New Guinea.