Dr Lydia M. Hopper

About Me

As a comparative psychologist I'm interested in how we, and our primate cousins, innovate and learn. I am dedicated to applying what I learn about animal cognition and behavior to enhance captive animal welfare.

I am the Director of Behavioral Management and an Associate Professor at the Johns Hopkins University School of Medicine.

Additionally, I chair the American Society of Primatologists Research and Development Committee, I am the Editor-in-Chief for the open-access journal Animal Behavior and Cognition, and I am a member of the Association of Primate Veterinarians and American Society of Primatologists joint working group.

Chimpanzee Memoirs

Edited by Stephen R. Ross and Lydia M. Hopper

What motivates someone to dedicate their lives to chimpanzees? This book brings together a range of chimpanzee experts who tell powerful personal stories about their lives and careers. It features some of the world’s preeminent primatologists—including Jane Goodall and Frans de Waal—as well as representatives of a new generation from varied backgrounds. Contributors share what inspired them, what shaped their career choices, and what motivates them to strive for solutions to the many challenges that chimpanzees face today.

Chimpanzees Memoirs was published in 2022 by Columbia University Press. You can order your copy here.

Chimpanzees in Context

Edited by Lydia M. Hopper and Stephen R. Ross

After a foreword by Jane Goodall, the book features sections that examine chimpanzee life histories and developmental milestones, behavior, methods of study, animal communication, cooperation, communication, and tool use. The book ends with chapters that consider how we can apply contemporary knowledge of chimpanzees to enhance their care and conservation.

Chimpanzees in Context was published in 2020 by the University of Chicago Press. You can order your copy here.

The beautiful cover art is by Ashley Bedore.

Recent Academic Publications

Lutz, C.K., Coleman, K., Hopper, L.M., Novak, M.A., Perlman, J.E., & Pomerantz, O. (in press). Nonhuman primate abnormal behavior: etiology, assessment, and treatment. American Journal of Primatology, e23380.

Hopper, L.M., Lake, B.R., Leinwand, J.G., Fultz, A., & Ross, S.R. (2022). Assessing chimpanzees' fluency of movement: applications for monitoring health and welfare. Applied Animal Behaviour Science, 250, 105612.

Leinwand, J.G., Fidino, M., Ross, S.R., & Hopper, L.M. (2022). Familiarity mediates apes' attentional biases towards human faces. Proceedings of the Royal Society B: Biological Sciences, 289, 20212599.

Kano, F., Furuichi, T., Hashimoto, C., Krupenye, C., Leinwand, J.G., Hopper, L.M., Martin, C.F., Otsuka, R., & Tajima, T. (2022). What is unique about the human eye? Comparative image analysis on the external eye morphology of human and nonhuman great apes. Evolution and Human Behavior, 43(3), 169-180.

Fowler, K. J., Hopper, L. M., Ross, S. R., Leahy, M., & Santymire, R. M. (2022). Monitoring the behaviour and stress physiology of male gorillas Gorilla gorilla gorilla for one year following bachelor group formation. Journal of Zoo and Aquarium Research, 10(1), 40–46.

Ross, SR, Lake BR, Fultz, A & Hopper LM (2021). An evaluation of thermal imaging as a welfare monitoring tool for captive chimpanzees. Primates, 62(6), 919-927.

Doelling, C.R., Cronin, K.A., Ross, S.R., & Hopper, L.M. (2021). The relationship between personality, season, and wounding receipt in zoo-housed Japanese macaques (Macaca fuscata): a multi-institutional study. American Journal of Primatology, 83(12), e23332.

Hopper LM, Gulli RA, Howard LH, Kano F, Krupenye C, Ryan AM & Paukner A (2021). The application of non-invasive, restraint-free eye-tracking methods for use with nonhuman primates. Behavior Research Methods, 53, 1003-1030

Contact me!

lydiahopper @ gmail.com