If they are into nature, you can try to attract birds to your backyard via feeders, birdhouses, water basins, planting various shrubs/vines that produce nectar/seed to attract hummingbirds and other species. A glass backed window feeder that suctions to the glass provides a great viewing opportunity. If you do get kosher birds to nest, possibly you can do shluach hakan but ask your LOR regarding being mafkir them first.