A feeder assembly includes a pan and an outer grill which is operatively associated with the pan. The outer grill defines a plurality of apertures therethrough through which birds can eat the feed presented on the pan. First and second inner grills can be rotated to partially mask the apertures through the outer grill in order to effectively change the width of the apertures. The inner grills are connected to one another by interlocking fingers such that rotation of one of the inner grills causes rotation of the other inner grill in the opposite direction. The inner grills are rotated by a dial member which is secured to the outer grill and which, upon rotation thereof between predetermined positions, causes rotation of the one inner grill, which in turn causes rotation of the other inner grill in the opposite direction.