Same as many human cultures - spreading fire to flush prey (and change the ecological trajectory of the place).
More proof that everything in Australia is out to kill us.
Birds definitely are not stupid but it challenges the belief that all animals are naturally afraid of fire. They manage to acquire burning materials without injuring themselves and relocate them to a suitable new location.
Animals are far, far smarter than people ever give them credit for....it'll be our downfall someday.