C. Owen Lovejoy: 246, 247; Jay Matternes: 212, 213, 263–265;

Steve Misencik: 74, 97, 144, 152, 171, 176, 205, 208–210; David Pilbeam: 270; Rheinisches Landesmuseum, Bonn: 44 (left); Larry Rubins: 259; University of California Press, Geology of the Oldu-vai Gorge: 69; Hank Wesselman: 91; Tim White: 222; Rob Wood:

229, 232, 233 (right), 242.

Color Section:

David Brill: 2, 4–9, 11; Michael Bush: 14; Cleveland Museum of Natural History: 15; Donald C. Johanson: 1, 3; Jay Matternes: 10;

John Reader: 13; Tim White: 12.