Pellets from short-eared owls (Asio flammeus) were collected during March 1990 and January-March 1992 from a former strip-mine area in southern Illinois (USA) and analyzed for prey remains. Microtines comprised 85.8% of 141 skull remains in 1990, and 85.0% of 147 skull remains in 1992. Results were similar to previous studies in Illinois and elsewhere.
Feldhamer, George A. and Machniak, Angela. "Feeding Habits of Short-eared Owls Overwintering in Southern Illinois." (Jan 1993).