Here in the Southeast, we see many varieties of birds, some living here and some just passing through. Perhaps you have had some experience in attracting birds with man-made feeders, baths, and birdhouses.
The addition of properly placed trees, shrubs, and plants can attract even more birds. Birds like a variety both in size and kind of planting. Variety in the plantings gives birds a choice of food—seeds, nuts, fruits, berries, flower nectar, etc.