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The Spring on a Wing Exhibit has re-sprung. After having 200 butterflies mysteriously die prematurely in the greenhouse at Cool Creek Nature Center, the exhibit has been restored this week, according to the Hamilton County Parks and Recreation Department. That means live butterflies are again part of the exhibit. The butterfly deaths stumped the nature staff. After weeks of investigating everything from the pesticides on the plants in the greenhouse to the climate in the facility and the cleaning products used on the windows, no one could find a definite cause, the staff said.