Prairie Warbler, photo by Michael Stubblefield, Audubon Photography Awards

The United States Geological Survey’s Breeding Bird Survey is considered the primary source of trend information for North American birdlife and is active in tracking Maryland birds.  David Ziolkowski, a program biologist with the Patuxent Wildlife Research Center, will discuss how the survey works and what it has revealed about changes in bird numbers and ranges, including those in southern Maryland.

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