Publications & CV

PUBLICATIONS

Clark IC, Greenfield P, Sandel AA, van Boekholt B, Lee KC, Reddy RB. In review. Adolescence as an ancestral window for social-relational learning: Evidence from wild chimpanzees.

Lee KC, Clark IR, Namaganda S, Acosta Florez D, Angedakin S, Reddy RB, Negrey J, Watts D, Mitani JC, Sandel AA, Langergraber KE. In review. Female chimpanzees more likely to patrol, attack, and kill during periods of territorial instability. 

Negrey JD, De La Rosa C, Reddy RB, Sandel AA, Frye BM, Langergraber KE, Angedakin S. In review. Terrestrial gait speed as a proxy for physical function across adulthood in wild chimpanzees.

Derby RN, Clift J, Rawat I, Reddy RB, Voyt R, Sandel AA. In review. Variation in limb length and width in wild chimpanzees across adolescence and young adulthood.

Sandel A, He Y, Ren J, Kei YL, Lee K, Clark IR, Reddy RB, Negrey J, Birungi C, Apamaku BA, Kanweri D, Kalunga D, Aliganyira C, Nakayima P, Katumba R, Kamugyisha B, Acosta-Florez D, van Boekholt B, Mbabazi G, Akamumpa E, Namaganda S, Tumusiime A, Angedakin S, Reinert G, Cucuringu M, Wipf D, Langergraber K, Watts D, Mitani J. 2026. Lethal conflict following group fission in wild chimpanzees. Science 392(6794), 216-220. Selected press: The New York Times, BBC, NPR, CNN, National Geographic, The Guardian, Smithsonian Magazine, The Wall Street Journal 

Lewis L, Ritov O, Reddy RB, Herrmann E, Sanchez-Amaro A, Gopnik A, Engelmann J. 2025. Chimpanzees and children are more curious about social interactions than individual actions. Proceedings of the Royal Society B: Biological Sciences 292, 20242242. 

Uchino BN, Reddy RB, Tacana T, Smoot S. 2025. Biological pathways linking loneliness to physical health. In T. Nelsen (Ed.), International Handbook of Loneliness.  New York: Springer.

Negrey JD, Angedakin S, Reddy RB, Sandel AA, Jombela S, Akamumpa E, Aliganyira C, Birungi C, Kalunga D, Kamugyshia B, Kanweri D, Mbabazi G, Nakayima P, Lee KC, Clark IR, Samuni L, Owens LA, Watts DP, Mitani JC, Goldberg TL, & Langergraber KE. 2025. Decreases in chimpanzee respiratory disease signs and viral shedding following implementation of anthroponotic disease prevention protocols at a long-term research site. Biological Conservation 308, 111225.

Reddy RB & Wellman HW. 2024. Children’s reasoning about a basic aspect of consciousness in others. European Journal of Developmental Psychology

Reddy RB, Samuni L, Städele V, Vigilant L, & Surbeck M. 2024. Maternal conflict intervention is more frequent in chimpanzee compared to bonobo development. Animal Behaviour 208, 127-126. Selected press: Scientific American

Sandel AA, Negrey JD, Arponen M, Clark IR, Clift JB, Reddy RB, & Ivaska K. 2023. The evolution of the adolescent growth spurt: urinary biomarkers of bone turnover in wild chimpanzees. Journal of Human Evolution 177, 103341

Reddy RB, Echelbarger M, Toomaijian N, Hammond T & Wellman HW. 2023. Do children help dogs spontaneously? Human-Animal Interactions. Selected press: The Guardian, Popular Science, The Wall Street Journal, BBC

Negrey JD, Mitani JC, Wrangham RW, Otali E, Reddy RB, Pappas TE, Grindle KA, Gern JE, Machanda ZP, Muller MN, Langergraber KE, Emery Thompson M, & Goldberg TL. 2022. Viruses associated with ill health in wild chimpanzees. American Journal of Primatology 84(2), e23358

Reddy RB, Sandel AA, & Dahl RE. 2022. Puberty initiates a unique stage of social learning and development prior to adulthood: insights from studies of adolescence in wild chimpanzees. Developmental Cognitive Neuroscience 58, 101176. Selected press: Science , Adaptivity: the Science of Adolescence Podcast, CBC’s Nature of Things Documentary: Teenager, Harvard Gazette, Born Curious: a Harvard Radcliffe Institute Podcast

Reddy RB, Langergraber KE, Sandel AA, Vigilant L, & Mitani JC. 2021. The development of affiliative and coercive reproductive tactics in male chimpanzees. Proceedings of the Royal Society B: Biological Sciences 288, 20202679. Selected press: BBC One’s Series, The Mating Game, Sciences et Avenir

Sandel AA & Reddy RB. 2021. Sociosexual behaviour in wild chimpanzees occurs in variable contexts and is frequent between same-sex partners. Behaviour 158(3-4), 249-276

Clark IR, Sandel AA, Reddy RB, & Langergraber KE. 2021. A preliminary analysis of wound care and other-regarding behavior in wild chimpanzees at Ngogo, Kibale National Park, Uganda. Primates 62(5), 697-702

Reddy RB & Sandel AA. Social relationships between chimpanzee sons and mothers endure but change during adolescence and adulthood. 2020 Behavioral Ecology and Sociobiology 74(150), 1-14. Selected press: National Geographic, Science Magazine

Reddy RB & Mitani JC. 2020. Adolescent and young adult male chimpanzees form affiliative, yet aggressive relationships with females. Journal of Human Evolution, 144, 102813. Selected press: BBC One’s Series, The Mating Game, Sciences et Avenir

Reddy RB & Wellman HW. 2020. Caregiving relationships as evolutionary and developmental bases of obligation. Commentary on target article: M. Tomasello, Moral psychology of obligation. Behavioral and Brain Sciences 43

Reddy RB & Mitani JC. 2019. Social relationships and caregiving behavior between recently orphaned chimpanzee siblings. Primates 60(5),389-400. Selected press: New Scientist, Origin Stories podcast

Negrey JD, Reddy RB, Scully EJ, Phillips-Garcia S, Owens L, Langergraber KE, Mitani JC, Emery Thompson M, Wrangham RW, Muller MN, Otali E, Machanda ZP, Hyeroba D, Grindle KA, Pappas TE, Palmenberg AC, Gern JE, & Goldberg TL. 2019. Simultaneous outbreaks of respiratory disease in chimpanzees caused by distinct viruses of human origin. Emerging Microbes & Infections 8(1),139-149

Sandel AA, Reddy RB, & Mitani JC. 2017. Adolescent male chimpanzees do not form a dominance hierarchy with their peers. Primates 58(1), 39-49

Reddy RB, Krupenye C, MacLean EL, & Hare B. 2016. No evidence for yawn contagion in lemurs. Animal Cognition 19(5), 889-898. Selected Press: Duke Today

Reddy RB, MacLean EL, Sandel AA, & Hare B. 2015. Social inhibitory control in five lemur species. Primates 56(3), 241-252

MacLean EL, Hare B, Nunn CL, Addessi  E, Amici F, Anderson RC, Aureli F, Baker JM, Bania AE, Barnard AM, Boogert NJ, Brannon EM, Bray EE, Bray J, Brent LJN, Burkart JM, Call J, Cantlon JF, Cheke LG, Clayton NS, Delgado MM, DiVincenti LJ, Fujita K, Herrmann E, Hiramatsu C, Jacobs LF, Jordan KE, Laude JR, Leimgruber KL, Messer EJE, Moura, AC de A, Ostojic L, Picard A, Platt ML, Plotnik JM, Range F, Reader SM, Reddy RB, Sandel AA, Santos LR, Schumann K, Seed AM, Sewall KB, Shaw RC, Slocombe KE, Su Y, Takimoto A, Tan J, Tao R, van Schaik CP, Virányi Z, Visalberghi E, Wade JC, Watanabe A, Widness J, Young JK, Zentall TR, & Zhao, Y. The evolution of self-control. 2014. Proceedings of the National Academy of Sciences 111(20), E2140-E2148. Selected press: National Geographic

MacLean EL, Sandel AA, Bray J, Oldenkamp RE, Reddy RB, & Hare B. 2013. Group size predicts social but not nonsocial cognition. PLoS One 8(6), 0066359