Traditional Owner, Ian Waina, observing the 17,300-year-old painting of a kangaroo.Image: Peter Veth, Balanggarra Aboriginal Corporation Archaeologists have discovered a 17,300-year-old painting of a kangaroo at a rock shelter in Western Australia, making it the oldest known painted figure ever to be found on the continent. Measuring 6.5 feet (2 meters) across, the kangaroo painting—made …