The brown bit on top at the rear looks a bit like a possum hitching a ride while sitting backwards
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It's only logical that there would be feral ostrich groups as they were farmed, pretty much unsuccessfully, on a few occasions, especially in SA. Camels thrive here, so why not ostriches?
We've seen the ostrich on the Birdsville track a couple of times over the years, a friend saw it last year when they were out there.