Dromornis stirtoni was a gigantic, flightless bird that lived in Australia during the Late Miocene. Standing over 3 meters tall and weighing approximately 500 kg, this bird had powerful legs, a massive beak, and was likely herbivorous. It inhabited open woodlands and played a significant role in its ecosystem by participating in seed dispersal and vegetation management.

Dromornis stirtoni, also known as Stirton's Thunder Bird, was native to Australia. This large, flightless bird lived during the Late Miocene to Pliocene epochs, approximately 8 million to 5 million years ago.

Dromornis stirtoni inhabited open woodlands and forested areas in prehistoric Australia. The climate during its time was generally warmer and more humid than present-day Australia, with a range of seasonal variations.

As a herbivore, Dromornis stirtoni likely fed on a variety of plant materials, including tough vegetation and possibly fruits. Its large size suggests it could have reached higher foliage. It occupied a niche similar to that of large herbivorous mammals in other continents, playing a significant role in its ecosystem by influencing vegetation structure and seed dispersal.