Aboriginal rock art shows Indonesian warships, study finds.

Aboriginal rock art in a cave in northern Australia depicting warlike watercraft has been identified as Indonesian warships from the Moluccas, according to a study published in the journal Historical Archaeology. The paintings suggest there may have been "physical violence" between the Indigenous people and visitors from afar. The researchers think that the Aboriginal people who created the rock art had either "intimate knowledge of the craft through long or close observation or from actually voyaging on them" and that they were "linked to trade, fishing, resource exploitation, head hunting or slavery."