I don't know, but I bet they get even meaner when they get hungry! I have visions of Mike Rowe (dirtiest jobs) trying to wrangle an ostrich. It got the best of him, lol.
When I was a kid my boy scout master tried to pluck a feather from an ostrich. He ended up with a torn ACL from what looked like a gentle kick. Anyway, I'll bet they eat more than chickens, and probably won't fit under the porch
See now, even an ole neanderthal can put 1 and one together...
Coyotes presenting a hazard to your chickens and goats?
Sic a herd of Ostriches on the puny little coyotes! In fact, fix up the Ostrichs' feet with prosthetic Velociraptor claws!