So savannah, yes, but in the more arid extremes, possibly. This same phrase is parroted over and over again in all the references. Again, I don't think the research has been done. And I would assume disturbance is an unfavorable factor for any nester. Also, Australia is a strange case.
Pastoral areas support highest densities of emus.
But they are new. This whole matter of predation pressures is rather complex. I'll check it out. I'll look for ref. Crypsis is critical.