A protected place to raise the young completes the list.  Cavity nesting birds use old decaying trees.  Homeowners and developers often remove the trees leaving no place for birds to nest.  Nesting boxes, installed in the proper location, provide a cozy home for cavity nesters such as bluebirds, chickadees, tufted titmice, nuthatches, woodpeckers, and screech owls.  Trees and shrubs provide nesting areas for birds who build their own nests.  In addition, a pond can be home to frogs, fish, dragonflies, and other insects.