Snags with old woodpecker holes provide homes for swallows, chickadees, nuthatches, bluebirds, owls, and other cavity_nesting birds that are rarely able to excavate their own nest sites. Snags provide ideal hunting perches for Red_tailed and Rough_legged Hawks, Bald Eagles, Hawk Owls, Great_horned Owls, and other raptors. Snags provide "songposts" to a wide variety of birds. Many small birds use songposts sticking above other vegetation to sing (to attract mates and proclaim nesting territory boundaries) and to perch on when looking out for predators and/or other birds.
When deciding where to place your feeders, remember that birds need protection from wind and predators, as well as perches to use while waiting to use the feeder. Thus, a feeder placed in the middle of an open yard may attract few birds. Try to put your feeders near shrubs and trees. However, thick vegetation around a feeder may provide ambush cover for cats. Keep free_roaming cats out of your yard, if possible. Put your feeders where they can be easily observed from a window to get the most enjoyment from them.