Nest View Bird House. Watch birds up-close as they build their nest and raise their young from the comfort of your home. Slanted roof helps to deter water from getting within the bird house. Sturdy Cedar wood construction with superior American-made suction cups to attach right to your window. Clear panel for great view. The Nest View Bird House does not include a perch near the entrance hole to discourage invasive species like English Sparrows from nesting in the house. Easy clean out; simply remove two screws holding plexi. Entrance hole measures 1 1/2 inch. The Nest View Window House can be installed year-round, though early March is the optimal time for spring nesting. Made in the USA.