The Maryland Department of Natural Resources offers up a clear, short, detailed article on attracting wildlife to small spaces.

This pamphlet is designed to give you ideas on how to turn your porch, deck or window into a wildlife garden, with helpful hints on how to arrange food, water and shelter elements of habitat for wildlife in small spaces. Songbirds, butterflies, hummingbirds, bees and moths comprise the majority of wildlife species that will visit a porch, deck or window wildscape.