BRISBANE (Reuters) - This year's sensation with school kids in the north Australian state of Queensland is bizarre: Macro Bug, the world's biggest cockroach. The whopper cockroaches are each about 80 mm long and weigh about 35 grams -- about 30 times heavier than the typical Australian house cockroach. Queensland Museum insect curator Geoff Monteith, who discovered a colony of the giant roaches six months ago, said that "Macropanesthia rhinoceros" was not the usual scuttling scavenger cockroach. It eats only dead leaves and is wingless with a hard, smooth shell. "They're very robust, the kids can pick them up and cuddle them and play with them and hand them around and then put them back in the box," Monteith said.A small colony of extra-large cockroaches were found six months ago near the central Queensland mining town of Middlemount.