west Victoria has also recently been suggested, based on dateable Aboriginal traditions. Fossil evidence suggests that the population of Genyornis at Lake Callabonna died around 50,000 years ago as the lake dried up as the climate changed and became drier. The birds recovered from the site also seemed to have been particularly prone to osteomyelitis as a result of getting stuck in the mud of the drying lake bed as the water receded. Eventually, when the lake dried, the population was left without their main source of water and subsequently died out. References Dromornithidae Quaternary birds of Australia Extinct flightless birds Bird genera Pleistocene birds