Rouen duck Rouen duckling is identical to the Mallard duckling in terms of plumage coloring. In North America, two distinct types are bred: the common, or production-bred, variety that is larger than a Mallard but has a typical duck conformation, and the much larger and squarer standard-bred variety. The production variety normally weighs 6–8 lbs (2.7–3.6 kg) while the standard-bred weighs 9–12 lb (4.1–5.4 kg). Rouen ducklings can be distinguished from wild mallard ducklings by the presence of a second stripe which runs across their face, just under their eye, whereas mallard ducklings have only one stripe which runs across their eye.
History of Rouen the First World War, the British used Rouen as a supply base and there were many military hospitals. Rouen was heavily damaged during World War II – approximately 45% of the city was destroyed. In June 1940, the area between the Rouen Cathedral and the Seine river burned for 48 hours as the Nazis did not allow firemen access to the fire. Other areas were destroyed between March and August 1944, just before and during the Battle of Normandy, which ended on the left bank of the Seine with the destruction of several regiments belonging to the German 7th Army.