Some types of birdbath are more attractive to birds, and safer for them, than other designs. Shallow, rough-surfaced, tall birdbaths are best. Birdbaths should be no more than 2 in. deep so birds of all sizes can use them. If your birdbath is deeper than that, place pea gravel or a flat stone in it to make a shallow spot for small birds.
Choose birdbaths with a rough surface for the best footing. Concrete, unglazed terra-cotta or plastic birdbaths with ridges have rough surfaces that birds like. A layer of pea gravel will add traction to a metal or glazed clay bath.
Set birdbaths on pedestals near shrubs so birds can flutter easily to a safe perch. If you put a birdbath on the ground, keep it away from dense plantings so cats can’t sneak up on them as they use it.