The pilot said they were in the landing flare and the main landing gear had touched down when he heard a loud bang and the airplane swerved right and then left. The pilot regained control of the airplane and taxied to parking. The pilot said that later he went out to the runway and found a 200 pound buck deer laying on the left side of the runway. An examination of the airplane revealed substantial damage to the right wing. No other anomalies were found.