This ingenious bird feeder attaches to most windows in seconds and has a semi-reflective back wall, so as birds feed, they are unaware that they are being watched. The top of the feeder flips up with stainless steel hinges, allowing bird seed to be poured in; as the birds eat, more feed spills onto the feeding platform, ensuring a continuous supply of food. Made of recycled milk jugs, the feeder will not warp, split, or rot like wooden feeders. Feeder attaches to the non-moving part of a window with four suction cups--bottom rests on window ledge. 12 3/4" H x 6 1/2" W x 12" L. (4 1/2 lbs.)