To a great extent, Mr. Grant is carrying out a promise to his beloved grandfather, who singled him out as a youngster as his heir to Wiradjuri culture.

“My grandfather was a Wiradjuri elder,” he said, and was anxious to pass along the culture. “But he was arrested after he called to me in Wiradjuri to come home from the park. ‘Barray yanha, barray yanha,’ ‘Come quickly,’ he called out.”

Mr. Grant was probably 8 or 9 years old the night a local policeman heard his grandfather, Wilfred Johnson, and locked him up. But he does not recall a sense of alarm.

“He was an elegant man,” he said of Mr. Johnson. “He was beautifully dressed, usually in a coat and hat. But he was black. So it wasn’t the first time he had spent the night in jail.”

After the arrest, Mr. Johnson, who spoke seven languages, refused to speak Wiradjuri in public.

“He was a linguist with enormous respect for his own people and culture,” said Mr. Grant, who speaks three languages himself: Italian, which he picked up while working at the sawmill, as well as English and Wiradjuri. “But he told me, ‘Things are different now.’ He would only speak his language in the bush.”

It was during those expeditions into the backcountry that Mr. Grant learned Wiradjuri, as well as tracking and hunting skills. He knows that a echidna’s back feet turn inward, complicating tracking. He can describe how his grandfather made a lasso out of long grass to catch a stunned goanna, a type of lizard, for dinner, and he says a rope laid around a bush house will stop snakes from passing over the threshold.