This Magic Mirror Window Bird Feeder from Duncraft incorporates a fiendishly clever one-way mirror as the back wall of the bird feeder. The birds landing up on the feeder see only their own reflections, while people within the house will be able to see the birds and everything going on in the feeder. You could be sitting up close with your nose touching the window, and the birds on the other side of the glass wouldn’t even know you’re there. The bird feed is stocked on the sides, fed in through a “chimney” at the top. The multiple perches enable several birds to land and hang out in the feeder at the same time. The whole thing is made of plastic, and sticks to the window with the help of four suction caps.