When I saw a headline over at Science News that contained the phrase "Ancient Demon Ducks," I knew I had found my topic for the day.
The article turned out to be about some recent research into a group of birds called dromornithids, which lived in Australia for about twenty million years, only becoming extinct about forty thousand years ago (thus overlapping the earliest ancestors of the Indigenous Australians by a short period). Besides being referred to as "the demon ducks of doom" (I'm not making that up), these birds are also called mihirungs, from the Djab Wurrung words mihirung paringmal, meaning "giant bird."
Giant they certainly were. Stirton's thunderbird (Dromornis stirtoni) reached three meters tall and could weigh over five hundred kilograms. This puts it in second place to the much more recent Madagascar elephant bird (Aepyornis spp.), which could reach two hundred kilograms heavier than that, and still existed only a thousand years ago.