Herons nesting in the wetlands of southeast Chicago are still being exposed to chemicals banned in the US in the 1970s, a research team reports. The chemicals do not appear to be affecting the birds’ reproductive success, however.
Herons nesting in the wetlands of southeast Chicago are still being exposed to chemicals banned in the US in the 1970s, a research team reports. The chemicals do not appear to be affecting the birds’ reproductive success, however.