Peter M. Kappeler is head of the Department of Behavior and Ecology at the German Primate Center in Gottingen. He is editor of Primate Males: Causes and Consequences of Variation in Group Composition and coeditor of Lemur Social Systems and Their Ecological Basis. Michael E. Pereira is a research associate at the Lincoln Park Zoo and a science teacher at The Latin School of Chicago. He is coeditor of Juvenile Primates: Life History, Development, and Behavior, also published by the University of Chicago Press.

Peter M. Kappeler is head of the Department of Behavior and Ecology at the German Primate Center in Gottingen. He is editor of Primate Males: Causes and Consequences of Variation in Group Composition and coeditor of Lemur Social Systems and Their Ecological Basis. Michael E. Pereira is a research associate at the Lincoln Park Zoo and a science teacher at The Latin School of Chicago. He is coeditor of Juvenile Primates: Life History, Development, and Behavior, also published by the University of Chicago Press.

Peter M. Kappeler is head of the Department of Behavior and Ecology at the German Primate Center in Gottingen. He is editor of Primate Males: Causes and Consequences of Variation in Group Composition and coeditor of Lemur Social Systems and Their Ecological Basis. Michael E. Pereira is a research associate at the Lincoln Park Zoo and a science teacher at The Latin School of Chicago. He is coeditor of Juvenile Primates: Life History, Development, and Behavior, also published by the University of Chicago Press.