Genyornis. Illustration and photo-reconstruction of the Australian goose-like non-flying bird Genyornis alert in woodland. Genyornis was heavily built, but not the largest dromornithid; that distinction goes to the late Miocene Dromornis stirtoni, one of the largest birds known. Its wedge-shaped head may have resembled that of a giant Magpie Goose. Genyornis was over two metres tall and would have weighed from 220-240 kilograms. The diet of Genyornis has not been determined by any direct evidence although it appears to have been herbivorous.