A communication system includes logic to detect a second communication device in proximity to a first communication device engaged in a call, and to provide a substantially uninterrupted transfer of selected parties to the call to the second communication device. The image sensor includes a pixel unit, a sampling unit sampling a signal from an output node of the pixel unit, a sinking unit sinking current from the output node of the pixel unit, and a current controller controlling the amount of current in the sinking unit. When the hook is pulled upwardly and away from the bird feeder, the hook pulls each of the hangers outwardly from within the bird feeder into continuously aligned, extended positions above the feeder that allow the feeder to always be positioned in a level configuration when the bird feeder is attached to a tree limb by the hook. The carrier defines a first through opening. A first code is calculated for each of the digital content files.