According to both The Daily Mail and The Telegraph, Australian paleontologists digging in Queensland have found the fossil of a 14-foot-long, 3-ton wombat. It’s in the genus Diprotodon. The Telegraph reports:
The diprotodon, about the size of a rhinoceros, was found on a remote cattle station in an area rich in the remains of prehistoric megafauna. The discovery of a virtually complete fossil makes it one of Australia’s most significant prehistoric discoveries.
“It was the biggest of them all – the biggest marsupial that ever lived on any continent,” one of the researchers, Professor Sue Hand, a palaeontologist at the University of New South Wales, told Australian Geographic.
According to the BBC, these were browsers who fed on trees and shrubs. Their dentition surely shows that—look at these teeth! (photo from Wikipedia):
There are various theories explaining their extinction, including climate and, most intriguingly, predation by humans. That idea is based on one bone that appears to have been pierced by a spear. The beasts also went extinct about the same time humans arrived in Australia: roughly 55,000 years ago.