Some forests become fragmented and in some cases completely gone. When fragmented wood lots are near human populations the house cat, raccoons, foxes and hawks prowl along the edges of these diminished wood lands. The song bird become part of the predator's menu. One of the worst enemies of song birds are people's kitty cats. These house cats roam outside during the day and the cats hunt song birds until they return home.
Developers can include woodland preservation when building.
Builders can provide tracts of undisturbed berry bushes and brush for nesting birds. Coastal residents can plant shrubs and rich producing berry plants. Flowering plants like butterfly weed and goldenrod will provide nectar for butterflies and insects. In turn these will provide food for the song birds. We can stop the decline in population of our song birds with a little foresight and gardening.