Dr. Hebe Ferreyra, Wildlife Conservation Society (image) Wildlife Conservation Society Share Print E-Mail Caption Dr. Hebe Ferreyra of the Wildlife Conservation Society holds a fulvous whistling duck, a native species in the wetlands of Santa Fe, Argentina. An ongoing study on the effects of lead on waterfowl in the landscape has resulted in a recent reduction in lead gunshot used by hunters. Credit M. Romano/Wildlife Conservation Society. Usage Restrictions One time usage only. Must use the following credit: M. Romano/Wildlife Conservation Society. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.