_Pens._ Having the hovers in the center of the house, makes it possible to have double sets of pens, one running from the center to the front wall and the other from the center to the rear wall. The pens are divided off by means of partitions made of one foot boards. These are high enough to confine the ducklings to their own pen and at the same time are easy to step over. In a house of this width, 20 feet, with 4 feet in the center taken up by the double hovers or walk, each pen is 8 feet long in the clear or 10 feet to the partition under the hover. The pens in the first third of the house are made 5 feet wide, in the next third 6 feet and in the last third 7 feet wide. When the ducklings are first brought from the incubator cellar they are placed in the pens nearest the heater as the temperature will run somewhat higher there than in the portions of the house more remote from the heater. These 5 x 10 foot pens will accommodate 125 baby ducklings although better results will be obtained by placing only 100 in a pen if sufficient room is available. Some duck growers use boards which can be slipped into slots made of cleats nailed to the pen partitions at different distances from the hover and which serve to confine the baby ducklings close to the hover for the first few days or until they learn to go under the hover to get warm. As additional ducklings are hatched later and brought to the brooder house, the ducklings already there are moved along the necessary number of pens in order to accommodate the new-comers in the pens nearest the heater. For this purpose, a small door is made in each partition next the outside wall of the house through which the ducklings can be driven. A broom is a handy implement to use in driving the ducklings as they can be pushed along in front of it. It is best to drive the ducklings just after they have been fed as they are not so nervous and afraid at that time. The increased width of the pens in the second and third portions of the house is for the purpose of taking care of the growth of the ducklings as they are moved along the house. Pens of the same width as those in which they were started become too crowded as the ducklings increase in size.