Herons persist in Chicago wetlands despite exposure to banned chemicals

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Loafing black-crowned night-herons near Lake Calumet Illinois with coking plant in background. Credit: Photo by Michael Jeffords Illinois Natural History Survey
Loafing black-crowned night-herons near Lake Calumet, Illinois, with coking plant in background. Credit: Photo by Michael Jeffords, Illinois Natural History Survey

Herons nesting in the wetlands of southeast Chicago are still being exposed to chemicals banned in the U.S. in the 1970s, a research team reports. The chemicals do not appear to be affecting the birds’ reproductive success, however. The findings appear in the current issue of the Journal of Great Lakes Research.


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