I once saw a tv program dealing with yard habitat. Came away with the
idea that diverse heights in plants have something for everyone. So
have grass, scrubs, small and large trees and they will come. Can be
appealing to humans too.

Here is a site that touches on water as well.

http://www.eastbaynature.com/habitat.htm

Bill

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Spam http://www.leraysvillecheese.com/ Many stars
Garden in shade zone 5 S Jersey USA