Australian scientists yesterday unveiled the biggest-ever graveyard of an ancient rhino-sized mega-wombat called diprotodon, with the site potentially holding valuable clues on the species’ extinction. The remote fossil deposit in outback Queensland state is thought to contain up to 50 diprotodon skeletons including a huge specimen named Kenny, whose jawbone alone is 70cm long. Lead scientist on the dig, Scott Hocknull from the Queensland Museum in Brisbane, said Kenny was one of the largest diprotodons he had ever seen and one of the best preserved specimens. Pigeon-toed and with a backward-facing pouch large enough to carry an adult human, Hocknull...