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Social Cognition: Are Primates Smarter than Birds?; P. Marler. Predicting Cognitive Capacity from Natural History: Examples from Four Corvid Species; R.P. Balda, et al. Assessing Body Condition in Birds; M.E. Brown. Avian Chemical Defense; J.P. Dumbacher, S. Pruett-Jones. Past and Current Attempts to Evaluate the Role of Birds as Predators of Insect Pests in Temperate Agriculture; D.A. Kirk, et al. An Evolutionary Approach to Offspring Desertion in Birds; T. Szeleky, et al. Index.