Birds are attracted to the sound of dripping or moving water. There are many different styles of birdbaths complex or simple .Be sure not to fill the birdbath with too much water. Shallow water only takes one or two inches. Put your birdbath out in the open so the birds will be aware of that opportunity. Keep the water clean and fresh, chance it once a week. Make this bath in such a position that birds are able to reach a nearby tree so they can perch on a branch and preen themselves afterwards.