In the wild, birds drink and bathe in water
droplets among leafy branches. To simulate this in your yard, you
need a shallow, flat receptacle with a dry edge or "beach" around
the perimeter and a gradual slope to a depth of two or three inches
in the center. The bath needs a rough bottom for safe footholds. An
upside-down garbage can lid is a simple and inexpensive
birdbath.
It should be located in a shady, protected spot
about 15 feet from the protective cover of shrubbery, and mounted
three feet off the ground. The water supply should be both
predictable and clean. The sound of running water is irresistible
to birds, so you might consider a thin jet or mist of water that
shoots vertically into an overhanging tree and then drips back into
the bath. If you decide to mist, time the mister in order to
conserve water and energy. Birds are most active between sunrise
and 10 A.M. and again in the later afternoon and early evening.
Change the water regularly and at least every three
days to deter mosquito infestation. If you want to attract wildlife
and you have outdoor cats, consider bringing them indoors or
reconsider using water to attract birds--you may be creating an
ecological trap.