A Max Aviation Inc. Beechcraft B100 King Air, C-FSIK was on an instrument flight rules flight from Montmagny to Montreal-St. Hubert Airport, QC (YHU), with 2 pilots and 4 passengers on board. The aircraft moved into position on the threshold of 3010-foot-long runway 26 and initiated the takeoff. On the rotation, at approximately 100 knots, the flight crew saw numerous birds in the last quarter of the runway. While getting airborne, the aircraft struck the birds and the left engine lost power, causing the aircraft to yaw and roll to the left. The aircraft lost altitude and touched the runway to the left of the centre line and less than 100 feet from the runway end. The takeoff was aborted and the aircraft overran the runway, coming to rest in a field 885 feet from the runway end. All occupants evacuated the aircraft via the main door. There were no injuries. The aircraft was substantially damaged. FINDINGS AS TO CAUSES AND CONTRIBUTING FACTORS: 1. The bird strike occurred on take-off at an altitude of less than 50 feet. Gulls were ingested in the left engine, which then lost power. 2. After the loss of engine power, the flight crew had difficulty controlling the aircraft. The aircraft touched the ground, forcing the pilot flying to abort the take-off when the runway remaining was insufficient to stop the aircraft, resulting in the runway overrun.