Giant kangaroos roamed Australia's outback until their food ran out

More than 300,000 years ago, giant kangaroos roamed the Australian outback, but didn't travel far from home, which experts say may have led to them disappearing entirely.The general rule is that the larger a mammal herbivore is, the further it travels for food. It's a trend seen with most modern kangaroo species.However, new peer-reviewed research published in PLOS One has found that, unlike modern kangaroos, the extinct marsupial megafauna Protemnodon was less mobile and had smaller home ranges than its size would have suggested.The study was a collaboration between the University of Wollongong, the University of Adelaide, Queensland Museum and Monash University.Lead researcher Chris Laurikainen Gaete, from the University of Wollongong, said the study measured the isotopes in the teeth of fossil giant kangaroos to estimate their foraging ranges over 300,000 years ago.The expectations were that these giant kangaroos standing at about two metres tall, would be mobile, but the results we...