1. Grow native plants found in your area, including trees, shrubs and other plants that offer food, such as pollen, nectar, nuts, cones, berries and other seeds.
2. Provide water for wildlife with a birdbath, small pond or shallow dish...or care for a natural spring or stream on or near your habitat.
3. Create protective cover for wildlife by growing a meadow, a prairie, densely branched shrubs or (when appropriate) evergreens. Place hollow logs and rock piles in your yard.
4. Build bird houses, attach to poles and monitor their use. Grow host plants for butterfly and moth caterpillars to eat and provide dense plants to create safe areas for nesting wildlife.
Be careful when choosing what to plant in your garden. Exotic species not native to your region can become invasive and can be harmful to both people and wildlife.

Courtesy of the National Wildlife Federation

more info: http://www.nwf.org/backyard/