Akoua-Koffi, C., Beermann, S., Calvignac-Spencer, S., ... Unwin, S., Wittig, R. M., & Wittiger, L. (2018). Obituary: Siv Aina Jensen Leendertz (Born Siv Aina Jensen: 1973–2018). International Journal of Primatology, 39(6), 1001-1004.

Löhrich, T., Behringer, V., Wittig, R. M., Deschner, T., & Leendertz, F. H. (2018). The use of neopterin as a noninvasive marker in monitoring diseases in wild chimpanzees. EcoHealth, 15(4), 792-803.

Schamberg, I., Wittig, R. M., & Crockford, C. (2018). Call type signals caller goal: A new take on ultimate and proximate influences in vocal production. Biological Reviews, 93(4), 2071-2082.

Samuni, L., Preis, A., Mielke, A., Deschner, T., Wittig, R. M., & Crockford, C. (2018). Social bonds facilitate cooperative resource sharing in wild chimpanzees. Proceedings of the Royal Society London B, 285(1888): 20181643.

Samuni, L., Preis, A., Deschner, T., Crockford, C. ǂ., & Wittig, R. (2018). Reward of labor coordination and hunting success in wild chimpanzees. Communications Biology, 1: 138.

McCarthy, M., Despres-Einspenner, M.-L., Samuni, L., Mundry, R., Lemoine, S., Preis, A., Wittig, R. M., Boesch, C., & Kühl, H. S. (2018). An assessment of the efficacy of camera traps for studying demographic composition and variation in chimpanzees (Pan troglodytes). American Journal of Primatology, 80(9): e22904.

Preis, A., Samuni, L., Mielke, A., Deschner, T., Crockford, C. ǂ., & Wittig, R. M. (2018). Urinary oxytocin levels in relation to post-conflict affiliations in wild male chimpanzees (Pan troglodytes verus). Hormones and Behavior, 105, 28-40.

Mielke, A., Preis, A., Samuni, L., Gogarten, J. F., Wittig, R. M., & Crockford, C. (2018). Flexible decision-making in grooming partner choice in sooty mangabeys and chimpanzees. Royal Society Open Science, 5(7): 172143.

Wu, D., Behringer, V., Wittig, R. M., Leendertz, F., & Deschner, T. (2018). Urinary neopterin levels increase and predict survival during a respiratory outbreak in wild chimpanzees (Taï National Park, Côte d'Ivoire). Scientific Reports, 8: 13346.

Tagg, N., McCarthy, M., Dieguez, P., ... Wessling, E. G., Wittig, R. M., Zuberbuehler, K., Kühl, H. S., & Boesch, C. (2018). Nocturnal activity in wild chimpanzees (Pan troglodytes): Evidence for flexible sleeping patterns and insights into human evolution. American Journal of Physical Anthropology, 166(3), 510-529.

Sonnweber, R., Araya-Ajoy, Y. G., Behringer, V., Deschner, T., Tkaczynski, P. J., Fedurek, P., Preis, A., Samuni, L., Zommers, Z., Gomes, C., Zuberbühler, K., Wittig, R. M., & Crockford, C. (2018). Circadian rhythms of urinary cortisol levels vary between individuals in wild male chimpanzees: A reaction norm approach. Frontiers in Ecology and Evolution, 6: 85.

Wessling, E. G., Deschner, T., Mundry, R., Pruetz, J. D., Wittig, R. M., & Kühl, H. S. (2018). Seasonal variation in physiology challenges the notion of chimpanzees (Pan troglodytes verus) as a forest-adapted species. Frontiers in Ecology and Evolution, 6: 60.

Adamescu, G. S., Plumptre, A. J., Abernethy, K. A., ... Gilby, I. C., Wittig, R. M., Breuer, T., ... Gourlet-Fleury, S., Mulindahabi, F., & Beale, C. M. (2018). Annual cycles are the most common reproductive strategy in African tropical tree communities. Biotropica, 50(3), 417-430.

Oelze, V. M., Wittig, R. M., Lemoine, S., Kühl, H. S., & Boesch, C. (2018). Meat eating frequencies in wild chimpanzees - The effect of absolute meat amounts, hunt participation and female reproductive state on the delta N-15 ratios of hair. American Journal of Physical Anthropology, 165(S66), 192-192.

Crockford, C., Deschner, T., & Wittig, R. M. (2018). The role of oxytocin in social buffering: What do primate studies add? In R. Hurlemann, & V. Grinevich (Eds.), Current Topics in Behavioral Neurosciences (pp. 155-173). Berlin: Springer.

Gogarten, J. F., Davies, T. J., Benjamino, J., Gogarten, J. P., Graf, J., Mielke, A., Mundry, R., Nelson, M. C., Wittig, R. M., Leendertz, F. H., & Calvignac-Spencer, S. (2018). Factors influencing bacterial microbiome composition in a wild non-human primate community in Taï National Park, Côte d’Ivoire. The ISME Journal, 12, 2559-2574.

Grützmacher, K., Keil, V., Leinert, V., Legullion, F., Henlin, A., Couacy-Hyman, E., Köndgen, S., Lang, A., Deschner, T., Wittig, R. M., & Leendertz, F. H. (2018). Human quarantine: Towards reducing infectious pressure on chimpanzees at the Taї Chimpanzee Project, Côte d'Ivoire. American Journal of Primatology, 80(1): e22619.

Knauf, S., Gogarten, J. F., Schuenemann, V. J., ... Raoult, D., Wittig, R. M., Roos, C., Leendertz, F. H., Šmajs, D., Nieselt, K., Krause, J., & Calvignac-Spencer, S. (2018). Nonhuman primates across sub-Saharan Africa are infected with the yaws bacterium Treponema pallidum subsp. pertenue. Emerging Microbes & Infections, 7(1): 157.

Lemoine, S., Boesch, C., Crockford, C., & Wittig, R. M. (2018). Effects of between-group competition on fitness in wild chimpanzees. In GFP 2019 Programme (pp. 28).

Patrono, L. V., Samuni, L., Corman, V. M., Nourifar, L., Röthemeier, C., Wittig, R. M., Drosten, C., Calvignac-Spencer, S., & Leendertz, F. H. (2018). Human coronavirus OC43 outbreak in wild chimpanzees, Côte d´Ivoire, 2016. Emerging Microbes & Infections, 7(1): 118.

Sirianni, G., Wittig, R. M., Gratton, P., Mundry, R., Schüler, A., & Boesch, C. (2018). Do chimpanzees anticipate an object's weight? A field experiment on the kinematics of hammer-lifting movements in the nut-cracking Tai chimpanzees. Animal Cognition, 21(1), 109-118.

Wittig, R. M. (2018). 40 years of research at the Taï Chimpanzee Project. Pan Africa News, 25(2), 16-18.

Wittig, R. M., & Crockford, C. (2018). Chimpanzees: Investigating cognition in the wild. In Field and laboratory methods in animal cognition (pp. 115-145). Cambridge: Cambridge University Press.

Wu, D., Löhrich, T., Sachse, A., Mundry, R., Wittig, R. M., Calvignac‑Spencer, S., Deschner, T., & Leendertz, F. H. (2018). Seasonal and inter‑annual variation of malaria parasite detection in wild chimpanzees. Malaria Journal, 17: 38.