Neither this book nor the research it describes would have been possible without the help of a great many people. These include Judy Weaver, Gail Cary, Shelly McKamey, and the entire staff of the Museum of the Rockies. I'm especially grateful to my friends, past and present, in the paleontology department—Pat Leiggi, Bob Harmon, Carrie Ancell, Ellen Lamm, Allison Gentry, Bea Taylor, Frankie Jackson, Jill Peterson, Matt Smith, and Karen Chin.
Undergraduate, graduate, and postgraduate students who contributed hard work, fresh ideas, and significant discoveries include David Varricchio, Yoshi Katsura, Greg Erickson, Mary Schweitzer, Kristi Curry, Rod Scheetz, Rebecca Laws, Pat Druckenmiller, Jill Peterson, April Lafferty, Peter Nassar, Vicki Clouse, Beverly Eschberger, Jody Smith, Des Maxwell, Ray Rogers, David Dilkes, and Scott Sampson.
And where would we professionals be without the help of amateur collectors and volunteer field specialists? I'm thinking now of Ken Olson, Curt Padilla, John Bruninga, Greg Clouse, Gloria Siebrecht, Mark Lindner, Jay Grimaldi, David Smith, Bob Downs, Sid Hoffsteder, Betty Quinn, Pat Murphy, Donna Coles, Gail McCrimmon, Wendy Sloboda, Nate Murphy, Hilory Korte, the many crews of Camp Makela, and especially my son Jason, who always managed to show up his father with better fossils.
For generously allowing us to collect on their land I want to express my gratitude to Chief Earl Oldperson, Don Dubray, and the Blackfeet Nation, the Lewis and Vernon Carroll families of Cut
Bank, Huey Monroe, Ricky Reagan, Gloria Sunquist, Truman Hall, Mark and Traci Tilstra, the McDowell family of Bridger, Marge Baisch and the Eaton Ranch. Logistical help, for which I'm also grateful, came from Chuck McAlpine and Marvin Weatherwax. I owe a debt of thanks as well to the Nature Conservancy, the Montana State Department of Natural Resources and Conservation, the Bureau of Land Management, the Bureau of Reclamation, and the Army Corps of Engineers.
Paleontology receives only a fraction of the financial assistance granted to other scientific fields but that fraction makes all the difference in the world. Our work during the past ten years has been supported by the National Science Foundation, National Geographic, Turner Foundation, Windway Foundation, and the MacArthur Foundation. We also received major donations from Jim and Bea Taylor, Barbara and Robbie Lee, Terry and Mary Kohler, Donna and Michael Coles, Steven Spielberg, and Damaris Waggoner. Thanks to you all.
Thanks also to those who donated equipment, services, and technical advice, including Cemax, Silicon Graphics, Sun Microsystems, Polaroid, Glenn Daleo and San Diego Children's Hospital, Sylvia and Peter Berens of Apunix, Bozeman Deaconess Hospital, and the General Electric Jet Engine Laboratories in Cincinatti, Ohio. And thanks to Canada Fossils Limited.
To colleagues Kevin Padian, Armand de Ricqles, Phil Currie, Ken Carpenter, the late, great Karl Hirsch, Jamie Powell, Dan Grigorescu, Rinchen Barsbold, John Ostrom, Dave Weishampel, Jim Knight, Ernie Vyse, Michael Ghiselin, Geerat Vermeij, John Ruben, and Jim Schmitt, I'm deeply grateful for countless stimulating conversations regarding dinosaurs, cladistics, and evolution.
My thanks to photographers Bruce Selyem and Terry Panasuk for their memorable pictures of specimens and excavations.
And a very special thanks to my wife Celeste Clair Horner, who did much of the artwork for the book.
Last, to Rob Makela: thanks, friend, for remaining close by. Ed and I are indebted to our agent Kris Dahl, who suggested the collaboration, and to our editor at HarperCollins, Eamon Dolan, who weathered it.
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