Introduction -- Helpful hints -- Birdhouses. Wren birdhouse ; Bluebird nest box ; Butterfly house ; Open nesting platform ; Purple Martin gourd colony ; Wood duck nest box ; Red-headed woodpecker house ; Tree swallow birdhouse ; Chickadee birdhouse ; Barn owl nesting box -- Feeders. Log feeder ; Down home bird feeder ; Suet feeder ; Canopy feeder ; Good ole days feeder ; Soft drink bottle feeders ; Barn feeder ; Snack bar feeder ; Prairie feeder -- Preferred foods of different birds -- National organizations for bird watchers.