Large-Billed Reed Warbler (image) Wildlife Conservation Society Caption Researchers from the Wildlife Conservation Society have discovered the only known breeding area for the large-billed reed warbler, once called "the world's least known bird species." Credit WCS-Afghanistan Usage Restrictions One time usage only. Use the following credit: WCS-Afghanistan 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.