1. Biology Department, College of William and Mary; Institute for Integrative Bird Behavior Studies; P.O. Box 8795, Williamsburg VA 23187 USA
2. Nondestructive Evaluation Lab, Department of Applied Science; College of William and Mary; P.O. Box 8795, Williamsburg VA 23187 USA
3. Biology Department; College of William and Mary, Institute for Integrative Bird Behavior Studies; P.O. Box 8795, Williamsburg VA 23187 USA