Songbird Essentials Window Wonder Two Tube Hummingbird Bird Feeder This two tube hummingbird feeder attaches to any window or smooth surface using a strong suction cup. Hummingbird nectar tubes are easy to clean and refill. The red tube caps and red beads are perfect for attracting hummingbirds. Wire extends beyond nectar tubes so that hummingbirds can perch while feeding. Attach to a window and watch from the other side as hummingbirds enjoy this beautiful two tube feeder.