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Wings: Volunteers of all ages (children must be accompanied by an adult) can help take the planet’s pulse to see how pesticides and loss of habitat have affected the proliferation of nature’s thin-winged creatures during the Xerces Society North American Butterfly Count starting at 8 a.m. Saturday, with a break at 10:30 a.m. for a short workshop. North Park Village Nature Center, 5801 N. Pulaski Rd. Call 312-744-5472 to preregister.