The home range of roadrunners can be quite large for a bird of its size, Ransom said. On average, male and female range sizes are about 200 acres and tend to be located near sizeable tracts of woody cover. Range sizes shrink by 50 percent to 60 percent during the winter.

A little harder to measure is the size of a roadrunner’s territory, he said. Smaller than the home range, a territory is actively defended against intruders, including other roadrunners.

http://www.sciencedaily.com/releases/2009/07/090731162141.htm