The 13,355-hour air transport pilot was in cruise flight at approximately 500 feet mean sea level (MSL) at approximately 120 miles per hour. The pilot looked down to scan the helicopter's instruments. As he began to look up, a large buzzard collided with the right windscreen and struck the pilot's face. The impact with the buzzard and the wind coming through the broken windscreen caused the pilot to become temporarily blinded. The pilot reported that he felt the helicopter pitch-up, and as he attempted to regain control of the turbine powered helicopter, blood began to hinder his vision. The pilot elected to execute a running landing into a bean field in his flight path. During the descent, the pilot was forced to use both hands and was unable to clear his vision. The pilot lost sight of the ground and the helicopter impacted on the aft portion of the left landing skid, rolled over and came to rest on its left side in a soybean field. The pilot reported having accumulated approximately 1,900-hours in the same make and model, with about 120 hours in the preceding 90 days.