Robert A. Askins,¹ Felipe Chávez-Ramírez,² Brenda C. Dale,³ Carola A. Haas,⁴ James R. Herkert,⁵ Fritz L. Knopf,⁶ Peter D. Vickery<sup>7

1</sup>Department of Biology, Connecticut College, New London, Connecticut 06320, USA
²Platte River Whooping Crane Trust, 6611 West Whooping Crane Drive, Wood River, Nebraska 68883, USA
³Canadian Wildlife Service, 200-4999 98th Avenue, Edmonton, Alberta T6B 2X3, Canada
⁴Department of Fisheries and Wildlife Sciences, MC 0321, Virginia Tech, Blacksburg, Virginia 24061, USA
⁵The Nature Conservancy, 301 S.W. Adams Street, Suite 1007, Peoria, Illinois 61602, USA
⁶713 Boulder Circle, Fort Collins, Colorado 80524, USA
⁷Center for Ecological Research, P. O. Box 127, Richmond, Maine 04357, USA