'[2] The Naualko language, which was spoken in the Wilcannia area, became extinct very early on as colonization began.
[2] It has recently been argued, though no certainty attaches to the hypothesis, that the language of the Milpulo was a dialect of Naualko.
[3] The Naulko moved over their tribal terrain's 10,000 square miles (26,000 km2), in the far western sector of New South Wales, from Dunlop to Murtee on the upper Darling River.
Norman Tindale, taking into consideration the distinctive word for 'yes' in their ethnonym, argues that the probabilities lie with their being an independent tribe.
In addition, early settlers like Frederic Bonney, familiar with the area's tribes, treated them as a discrete group.