Greater Roadrunners are numerous and their breeding populations are stable, according to the North American Breeding Bird Survey. Partners in Flight estimates the global breeding population at 1.1 million, with 62 percent occurring in the U.S. and the other 38 percent in Mexico. They rate a 9 out of 20 on the Continental Concern Score and are not on the 2012 Watch List. 23.Threats to roadrunners include illegal shooting, often in the mistaken belief that they threaten populations of popular game birds. Habitat loss is a bigger threat, as roadrunners need room to roam and are susceptible to development that fragments their territories and eliminates prey and nest sites. Household pets, feral animals, pedestrians and traffic can also displace or kill roadrunners. Southern California has seen a significant drop in roadrunner numbers over the past several decades.