My Spy Birdhouses My Spy Birdhouse? easily mounts to any window in your home to give you your very own up close and personal window into the secret life of birds It is the perfect window into the secret life of birds. Watch birds build nests, hatch their nests and feed their young! Safely attaches to any glass surface via 3 super strong all-weather suction cups Birdhouse comes with a clear acrylic back panel with special 2-way mirror film on one side that allows you to see the birds inside but prevents birds from seeing you Watch birds build nests, hatch their eggs, feed their young, and then watch as baby birds grow and make their first flight