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  • Herons persist in Chicago wetlands despite exposure to banned chemicals

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      Pair of black-crowned night-herons in nesting cover near Lake Calumet, in southeastern Chicago.

      Photo by Michael Jeffords, Illinois Natural History Survey

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      Chemicals banned in the 1970s are still showing up in the eggs and young of black-crowned night-herons nesting in the wetlands of southeast Chicago. The exposures do not appear to be affecting the birds' reproductive success, however, according to Jeff Levengood, a professor of veterinary biosciences and a wildlife toxicologist at the Illinois Natural History Survey.

      Photo by L. Brian Stauffer

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      Loafing black-crowned night-herons near Lake Calumet, Illinois, with coking plant in background.

      Photo by Michael Jeffords, Illinois Natural History Survey

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