Editor-in-Chief introduction and welcome by Lydia M. Hopper

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Hardly habitual: chimpanzees and gorillas show flexibility in their motor responses when presented with a causally-clear task by Sarah L. Jacobson, Lydia M. Hopper

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Evaluating the Behavior and Temperament of African Penguins in a Non-Contact Animal Encounter Program by Sana T. Saiyed, Lydia M. Hopper, Katherine A. Cronin

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Same Space, Different Species: The Influence of Exhibit Design on the Expression of Zoo-Housed Apes’ Species-Typical Retiring Behaviors by Samantha C. Earl, Lydia M. Hopper, Stephen R. Ross

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Zoo-Housed Chimpanzees Can Spontaneously Use Tool Sets But Perseverate on Previously Successful Tool-Use Methods by Laura M. Bernstein-Kurtycz, Lydia M. Hopper, Stephen R. Ross, Claudio Tennie

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Studying primate cognition in a social setting to improve validity and welfare: a literature review highlighting successful approaches by Katherine A. Cronin, Sarah L. Jacobson, Kristin E. Bonnie, Lydia M. Hopper

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Captive chimpanzee foraging in a social setting: a test of problem solving, flexibility, and spatial discounting by Lydia M. Hopper, Laura M. Kurtycz, Stephen R. Ross, Kristin E. Bonnie

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When given the opportunity, chimpanzees maximize personal gain rather than “level the playing field” by Lydia M. Hopper, Susan P. Lambeth, Steven J. Schapiro, Sarah F. Brosnan

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Primates' Food Preferences Predict Their Food Choices Even Under Uncertain Conditions by Sarah M. Huskisson, Crystal L. Egelkamp, Sarah L. Jacobson, Stephen R. Ross, Lydia M. Hopper

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Evaluating mood changes in response to anthropogenic noise with a response-slowing task in three species of zoo-housed primates by Katherine A. Cronin, Emily J. Bethell, Sarah L. Jacobson, Crystal Egelkamp, Lydia M. Hopper, Stephen R. Ross

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A Comparative Perspective on Three Primate Species’ Responses to a Pictorial Emotional Stroop Task by Lydia M. Hopper, Matthias Allritz, Crystal L. Egelkamp, Sarah M. Huskisson, Sarah L. Jacobson, Jesse G. Leinwand, Stephen R. Ross

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Establishing an infrastructure for collaboration in primate cognition research. by Many Primates, Drew M Altschul, Michael J Beran, Manuel Bohn, Josep Call, Sarah DeTroy, Shona J Duguid, Crystal L Egelkamp, Claudia Fichtel, Julia Fischer, Molly Flessert, Daniel Hanus, Daniel B M Haun, Lou M Haux, R Adriana Hernandez-Aguilar, Esther Herrmann, Lydia M Hopper, Marine Joly, Fumihiro Kano, Stefanie Keupp, Alicia P Melis, Alba Motes Rodrigo, Stephen R Ross, Alejandro Sánchez-Amaro, Yutaro Sato, Vanessa Schmitt, Manon K Schweinfurth, Amanda M Seed, Derry Taylor, Christoph J Völter, Elizabeth Warren, Julia Watzek

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The Evolution of Primate Short-Term Memory by ManyPrimates, Géraud Aguenounon, Matthias Allritz, Drew M. Altschul, Sébastien Ballesta, Alice Beaud, Manuel Bohn, Sally L. Bornbusch, Angela Brandão, James Brooks, Thomas Bugnyar, Judith M. Burkart, Léa Bustamante, Josep Call, Charlotte Canteloup, Chuangshi Cao, Kai R. Caspar, Diana da Silva, Alexandra A. de Sousa, Sarah E. DeTroy, Shona Duguid, Timothy M. Eppley, Claudia Fichtel, Julia Fischer, Chi Gong, James A. Grange, Nicholas M. Grebe, Daniel Hanus, Daniel Haun, Lou M. Haux, Yseult Héjja-Brichard, Annabella Helman, Istvan Hernadi, R. Adriana Hernandez-Aguilar, Esther Herrmann, Lydia M. Hopper, Lauren H. Howard, Lei Huang, Sarah M. Huskisson, Ivo Jacobs, Zhiyong Jin, Marine Joly, Fumihiro Kano, Stefanie Keupp, Evelin Kiefer, Balázs Knakker, Katalin Kóczán, Larissa Kraus, Sze Chai Kwok, Marie Lefrançois, Laura Lewis, Siyi Liu, Miquel Llorente, Elizabeth Lonsdorf, Louise Loyant, Katarzyna Majecka, Luke Maurits, Hélène Meunier, Flávia Mobili, Luca Morino, Alba Motes-Rodrigo, Vincent Nijman, Caroline Nkov Ihomi, Tomas Persson, Dariusz Pietraszewski, Juan Felipe Reátiga Parrish, Anthony Roig, Alejandro Sánchez-Amaro, Yutaro Sato, Gabriela-Alina Sauciuc, Allie E. Schrock, Manon K. Schweinfurth, Amanda Seed, Caroline L. Shearer, Vedrana Šlipogor, Yanjie Su, Kirsten Sutherland, Jingzhi Tan, Derry Taylor, Camille A. Troisi, Christoph J. Völter, Elizabeth Warren, Julia Watzek, Pauline Zablocki-Thomas

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