DAVID H. ELLIS,^* WILLIAM J. L. SLADEN,^** WILLIAM A. LISHMAN,^*** KENT R. CLEGG,^**** JOSEPH W. DUFF,^*** GEORGE F. GEE,^***** JAMES C. LEWIS<sup>******


*</sup>David H. Ellis (dellis@usgs.gov) is a research behaviorist with the USGS Southwest Biological Science Center, HC 1, Box 4420, Oracle, AZ 85623. This study was completed while he served at USGS Patuxent Wildlife Research Center, Laurel, MD; his studies with cranes and raptors span four decades and five continents.
^**William J. L. Sladen is director of environmental studies at Airlie Center, 7078 Airlie Road, Warrenton, VA 20187; his studies with swans and penguins range from the Arctic to the Antarctic.
^***William A. Lishman, a sculptor by profession, and Joseph W. Duff, a professional photographer, are cofounders of Operation Migration, Box 280, Blackstock, Ontario, L0B 1B0, Canada.
^****Kent R. Clegg, 550 Bench Lago Road, Grace, ID 83241, is a farmer and rancher whose involvement in crane research spans three decades.
^*****George F. Gee, a research physiologist with the USGS Patuxent Wildlife Research Center, 12022 Beech Forest Road, Laurel, MD 20708, began his studies of cranes in 1967.
^******James C. Lewis, 7712 Midge NE, Albuquerque, NM 87109, worked with the US Fish and Wildlife Service and was the US coordinator of whooping crane research and leader of the US Whooping Crane Recovery Team.