(Cue Woman screaming in the background. Thank you)
In this case, I wanted to draw attention to the fact that Australian rock-art does indeed depict the giant birds facetiously called Demon Ducks of Doom, including depictions of their distinctive type of head. The news item supposes the artwork is therefore very old: but on the contrary the big birds could have survived the mass extinction and the paintings could be more recent.
The Demon Ducks (which are of course not related to ducks in the least but are more closely related to the cranes, rails and bustards; it is perhaps better to call them Bigger Bustards) incidentally would have stood between eight and nine feet tall in life, with the females presumably larger than the males.
Best Wishes, Dale D.