Have you heard of this designation before ?
Interesting interactive map for sites within states at: http://www.audubon.org/bird/iba/index.htmlImportant Bird Areas, or IBAs, are sites that provide essential habitat for one or more species of bird. IBAs include sites for breeding, wintering, and/or migrating birds. IBAs may be a few acres or thousands of acres, but usually they are discrete sites that stand out from the surrounding landscape. IBAs may include public or private lands, or both, and they may be protected or unprotected.
Throughout the IBA process, the status of sites are characterized by the following terms: Potential, Nominated, Identified, Recognized, Pending, Rejected, Delisted, Merged. See definitions of Status Terms.