NEST BOARDS: Nest boards (N) In Fig III, approximately lx8xl3 board, should be of sufficient width to fit snugly against the sides of pens. Nest board front end is sawed off to a 2-inch taper to provide Incline (In) permitting pre-sight young to return freely to the nest. Two nails, 1½-inch length (NS), one a short distance behind the other, should be driven through nest board before installed to reach through hdw. cl. and prevent board sliding forward except when caretaker removes same for complete cleaning of pen. Nest board gives mother hamster a sense of security and prevents small food particles falling from food stores by the nest. Different lengths of neat boards may be used. This length provides about 8 inches of self-cleaning floor. Some producers use No. 6 hdw. cl. floors without nest boards.
WATER: J in Fig. III shows a small watering jar, such as face cream jar, approximately 1½ high and 1- to 1½-in. wide. Larger jars may be used for adults only. A strip of tin keeps the jar always in same location. The bottle and tube waterer shown in Chap. 24 is preferred by many.
GUARD BOARD: Years ago, the author devised the guard board shown as GB in Figs. I and III, and appearing in other pen plans herein. It serves several purposes. Young are absolutely prevented falling out the door when caretaker opens it. During moments of restlessness, adult hamsters gnaw at this uncovered board, since they instinctively treat it as their chief obstacle at the closed door. Such gnawing furnishes endless employment and usually distracts them from gnawing elsewhere, and their teeth are properly exercised for maintenance of healthful dental condition. Guard boards are about 2x8 and ⅜ to ½ thick. Any wooden box material is satisfactory. Hamsters gnaw the board down sufficiently for replacement every few weeks, which is a sign that they are sufficiently exercising their teeth. This small thin board is held in place immediately inside the door by means of retainers GBR in Figs. I, VII and VIII; or simply by means of thin-headed nails or staples as shown in Illus. 31, Chap. 23. To make the GBR, use a piece of heavy sheet metal (galv. or tin) 1x1¾, or 1½x1¾, which may be bent with sufficient ease. As in Fig. VII, drill or punch 2 holes (x) for use of screws or short nails. Bend metal along lines B so that guard board retainer fits well over the end of ½-lnch board as in Fig. VIII. Now install GBR inimediately inside doors, so that when doors close each door butts up against the guard board in its doorway. Fig. I shows right pen without door to Illustrate G.B. sliding, down. into place.
As per Fig. III, hamsters build nests cup-shaped in warm weather (dash line H) and ball-shaped in eztreme cold temperature (dash line W). Nests cover 9 to 11 inches on rear of pen floor. C:B represents the cup or bottom of nest.
Caretaker may place vegetable trimmings and cubes of animal food upon the wire, grains and other small foods may be placed on nest board near edge of nestbig material (FP) to prevent loss through self-cleaning area of floor. Hamsters then usually store food in areas marked FS and in corners back of the nest.
DROPPINGS TRAYS: One tray extends under both pens of the unit, Tray may be 1 or 2 Inches deep, as desired; and either 12 long as in Fig. III, or 23 long as in Fig. IV. Light weight wood material, such as
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