I have been in the Australian outback in a Range Rover that could not catch up with one of these large, flightless birds.
It is no easy thing to run down such a speedy BIG animal like this. Also, they can kick the hell out of anybody who tries to grab one.
This bird might be killed or tranquilized with a rifle but it will be no easy task to catch one or even get a good shot at it.
All of that, and they would blend right in with the standing corn or soybeans popular in the area.