The Mosquito was largely built out of plywood in order to save strategic materials. It was light, fast and agile. Versions of the Mosquito served in many roles. The B. Mk. IX was a light bomber. The RAF did most of their bombing at night (hence the black undersurfaces). Mosquitos were able to outrun most Nazi night-fighters (such as the Messerschmidt Bf 110), which is one of the reasons why they had the lowest loss-rate of all RAF bombers.