This work may possibly date from c.1940 when the illustrations were done by the artist for "The Way of the Whirlwind". Brolgas featured in the book. "The mother brolga put out her beak and pecked him gently. The feathers had gone and all she felt was a little, hard, naked leg". "He's not a brolga at all," she shrieked. "He's a little human boy!" (http://www.invaluable.com/auction-lot/elizabeth-durack-1915-2000-flight-of-the-brolga-26-c-655f47294d)