I birded Brezina Woods Forest Preserve in western Cook Co. this morning. It is along Salt Creek between Cermak and 31st on the east side of Mannheim Rd. I saw 23 species of warblers with good number of many species. Less common species included an Orange-crowned, Blue-winged, 3 Golden-winged, 7 Northern Parulas, 3 Black-throated Blues, and 2 Mourning. The most common species were American Redstart with 28 and Magnolia with 22, but 10 species were represented by 10 or more individuals. Non-warbler migrants were around in reasonable numbers, but nothing unexpected.