Khaki Campbell ducks seldom hatch out others' young; however, in very communal situations do hatch large broods together. Most brooding behavior has been sacrificed in exchange for prolific egg laying ability in this breed. The ducks, when raised by hand, are not usually defensive of their eggs or nests, making collection of eggs very easy. Mechanical incubators or broody chickens are used to hatch out Khaki Campbell ducklings when ducks are not present in the process. Incubation takes approximately 23 to 28 days for a Khaki Campbell duckling to hatch and eggs need to be inspected for ducklings that have not emerged
Rouen in the since destroyed "tour de lady Pucelle"); the "Church of Saint Ouen" (12th–15th century); the "Palais de Justice", which was once the seat of the "Parlement" (French court of law) of Normandy; the Gothic "Church of St Maclou" (15th century); and the Museum of Fine Arts and Ceramics which contains a splendid collection of faïence and porcelain for which Rouen was renowned during the 16th to 18th centuries. Rouen is also noted for its surviving half-timbered buildings. There are many museums in Rouen: the Musée des Beaux-Arts de Rouen, an art museum with pictures of well-known painters such as