Nature World: A new study suggests that bush fires, set-up by aborigines, help increase kangaroo numbers. Australia's Aboriginal Martu people have been ritually setting small fires to expose lizards for the past 2,000 years. A new study by the researchers at the University of Utah has found that the fires actually benefit kangaroos and other species in the region. At first, it might seem counterintuitive that hunting and setting up bush fires can help kangaroos survive. However, researchers have found that these...