Birdhouse for Viewing Nesting Birds: Secure clear acrylic fastens to the rear of a wooden birdhouse and provides a viewing point for birds You can watch them grow from chicks to adults! Sturdy Suction Cup and Safety Ring: The suction cup mounts to the window and the additional safety ring provides support for nesting birds External window bird nest box bird house with strong suction cup DIY birdhouse: You can also use tools to paint the birdhouse in your favorite color to create a beautiful DIY birdhouse.