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Contact

Department of Human Behavior, Ecology and Culture

Deutscher Platz 6
04103 Leipzig

phone: +49 (0)341 3550 - 315
fax: +49 (0)341 3550 - 333

e-mail: cissewski@eva.mpg.de


Dr. Catherine Crockford

Independent Research Group Leader

Max Planck Institute for Evolutionary Anthropology
Department of Human Behavior, Ecology and Culture
Deutscher Platz 6
D-04103 Leipzig, Germany

phone: +49 341 3550 220
e-mail: crockfor@[>>> Please remove the brackets! <<<]eva.mpg.de


CV [PDF]

Research Interests
Press
Publications

Research Interests

Together with Roman Wittig, I co-direct the Tai Chimpanzee Project, Tai National Park, Ivory Coast, which currently has three habituated chimpanzee groups with a fourth under habituation, as well as one habituated sooty mangabey group. This is a dynamic group encompassing topics ranging from behavioural ecology and conservation to psychology and health and disease.

Together with my research group, I investigate questions related to the evolution of sociality, social cognition, communication and the brain. I examine these from a) comparative and b) developmental perspectives addressing questions of a) sociality, health and fitness; b) maternal effects on the development of sociality, cognition and communication; c) species and individual variation in communication and cognition and correlated neural correlates. I use long-term data sets of behavioural observations, non-invasive hormone sampling and field experiments to address these questions in chimpanzees and other wild primates, including bonobos, baboons and sooty mangabeys. In terms of the evolution of sociality, we examine underlying physiological and cognitive mechanisms that may explain links between stress, social bonds and cooperation, between non-kin as well as kin.

ERC project: The influence of early life experience on later social skills in chimpanzee

Social bonding success in life impacts on health, survival and fitness. It is proposed that early and later social experience as well as heritable factors determine social bonding abilities in adulthood, although the relative influence of each is unclear. In humans, the resulting uncertainty likely impedes psychological and psychiatric assessment and therapy. One problem hampering progress for human studies is that social bonding success is hard to objectively quantify, particularly in adults. I propose to directly address this problem by determining the key influences on social bonding abilities in chimpanzees, our closest living relative, where social bonding success can be objectively quantified, and variation in underlying hormonal and cognitive mechanisms can be examined.

We assimilate behavioural, non-invasively sampled hormonal and genetic data from five wild chimpanzee communities across two subspecies with the aim to assess the impact mothers have on offspring development and on their offspring’s future adult life, for example we test the impact of post-weaning maternal loss on offspring behaviour, hormones and reproductive success.

Funding

Current Lab Members

Post doctoral Researchers
  • Aisha Bründl: Chimpanzee developmental milestones and causes of variation
  • Dr. Cedric Gerard-Buttoz: Variation in cooperation between wild chimpanzees and bonobos
  • Kathrin Kopp: Mapping the behavioural and cognitive variation across chimpanzees in zoos and sanctuaries (Head of Unit)
  • Dr. Patrick Tkaczynski: The influence of hormonal variation on social bonding capacities in chimpanzees, using a multi-hormonal approach
PhD Students
  • Tatiana Bortolato
  • Clement Gba: Food competition in male and female mangabeys
  • Mathieu Malherbe
  • Virgile Manin: Sociality, hormones and health
  • Sylvain Lemoine: Intergroup spacing and relationships between four neighbouring
    chimpanzee communities
  • Prince Valé: Energy consumption and usage in wild chimpanzees
  • Veterinary Staff: Ariane Düx, Tobias Graessle, Jenny Jaffe
  • Research Assistants: Joe Broomfield, Sonja Ebel, Mathilde Grampp, Peter Niehoff, Pieter Nyssen, Isabella O’Neal
  • Technical staff: Amelie Pettrich, Tina Knittel
Alumni:
  • Post docs, Isaac Schamberg, Pawel Fedurek, Ruth Sonnweber, Natali Uomini.
  • PhDs: Alex Mielke, Liran Samuni, Anna Preis.

Current collaborations

  • Alfred Anwander, Neuropyschology Dept, MPI Human Cognitive & Brain Sciences, Leipzig
  • Jacinta Beehner, University of Michigan, Ann Arbor, USA
  • Thore Bergman, University of Michigan, Ann Arbor, USA
  • Tobias Deschner, Head of Field Endocrinology Laboratory, primatology department, MPI EVA.
  • Claudia Fichtel, German Primate Center, Göttingen, Germany.
  • Angela Friederici, Director of Neuropyschology Dept, MPI Human Cognitive & Brain Sciences, Leipzig
  • Daniel Haun, Director Leipzig Research Center for Child Development, University of Leipzig.
  • Esther Herrmann, Group leader, Psychology Department, MPI EVA.
  • Gottfried Hohmann, Director of Lui Khotale Bonobo Field Site, Congo, and Group leader, primatology department, MPI EVA.
  • Sven Grawunder, Keele University.
  • Philipp Gunz, Human Evolution Dept, MPI EVA, Leipzig
  • Peter Kappeler, German Primate Center, Göttingen, Germany.
  • Lydia Lunz, Oxford University, Oxford, UK
  • Alex Mielke, Oxford University, Oxford, UK
  • Markus Morawski, Paul Flechsig Institute of Brain Research, Leipzig.
  • Kevin Langergraber, Anthropology Department, Arizona State University.
  • Fabian Leendertz, Group leader, Epidemiology of highly infectious diseases, Robert Koch Institute, Berlin.
  • Richard McElreath, Director of Human Behavioural Ecology Department, MPI EVA.
  • Julia Ostner, German Primate Center, Göttingen, Germany.
  • Liran Samuni, Harvard University, Boston, USA
  • Oliver Schülke, German Primate Center, Göttingen, Germany.
  • Steve Smith, Konrad Lorenz Institute for Ethology, University of veterinary medicine, Vienna.
  • Martin Surbeck, Harvard University, Boston, USA.
  • Linda Vigilant, Group leader, Molecular Genetics Lab, primatology department, MPI EVA.
  • Nik Weiskopf, Director of Neurophysics Dept, MPI Human Cognitive & Brain Sciences, Leipzig 
  • Klaus Zuberbühler, Biology Department, University of Neuchatel.

Press

Press review on publications

[link]

Taï Chimpanzee Projects News on twitter

[link]

 

Nature Communications has published: Wittig, R.M., Crockford, C. et al. "Social support reduces stress hormone levels in wild chimpanzees across stressful events and everyday affiliations"
Supplementary Video

Portrait & General Reports

Gaidos S. Furry Friends Forever: Humans aren’t the only animals who benefit from having someone to count on. 2012. 181: 18-21
(link)

Science Magazine, 2 April 2010: Talking chimp to chimp – Review of our work in Budongo Forest Uganda
(PDF)
 

Scientific Commentary

Nature, 18 September 2014: Animal Behaviour: The evolutionary roots of lethal aggression. Commentary by Joan B. Silk (PDF)

Nature, 17 April 2014: Evolutionary Biology: Dating chimpanzees. Commentary by M. Haslam (PDF)

Current Biology, 24 January 2012: Animal Cognition: Chimpanzee alarm calls depend on what others know. Commentary by Robert M. Seyfarth & Dorothy L. Cheney (PDF)

Current Biology, 10 August 2010: Primatology: “A faithful friend is the medicine of life”. Commentray by Susan C. Alberts (PDF)

Press Review of Specific Papers

Vocalizing in chimpanzees is influenced by social-cognitive processes. Science Advances, 3(11): e1701742. November 2017
Nature (link), Scientific American (link), Newsweek (link), New York Times (link), LA times (link), The Verge (link)

Social support reduces stress hormone levels in wild chimpanzees across stressful events and everyday affiliations'. Nature Communications 7, 13361
New Scientist(link), Newsweek (link), LA Times (link), Mail Online (link)

Lethal aggression in Pan is better explained by adaptive strategies than human impacts. Nature, 2014. 17 Sep 2014: Die Welt (PDF). 18 Sep 2014: AAAS News (PDF), New York Times (PDF), BBC News (PDF).

Triadic social interactions operate across time: a field experiment with wild chimpanzees. Proceedings of the Royal Society London B, 2014. 6 Jan 2014: SCINEXX (PDF), Weser Kurier (PDF)

Food sharing is linked to urinary oxytocin levels and bonding in related and unrelated wild chimpanzees. Proceedings of the Royal Society London B, 2014. 15 Jan 2014: Washington Post (PDF), Daily Mail (PDF), Tagesspiegel (PDF), Die Welt (PDF).

Urinary oxytocin and social bonding in related and unrelated wild chimpanzees. Proceedings of the Royal Society London B, 2013. 23 Jan 13: BBC Nature (PDF), Der Spiegel (PDF), 25 Jan 13: Leipziger Volkszeitung (PDF)

Wild chimpanzees inform ignorant group members of danger. Current Biology, 2012.
29 Dec 11: BBC Nature (PDF), The Guardian (PDF), Wiener Zeitung (PDF); 30 Dec 11: Bild der Wissenschaft (PDF), Hamburger Abendblatt (PDF), Süddeutsche Zeitung (PDF), USA Today (PDF); 4 Jan 12: Neue Züricher Zeitung (PDF)

The benefit of social capital: Close social bonds among female baboons enhance offspring survival. Proceedings of the Royal Society B, 2009. 
10 July 09 The Guardian (PDF)

Publications

* joint first author
ǂ joint senior author

In press

Behringer, V., Preis, A., Wu, D., Crockford, C., Leendertz, S. A. J., Wittig, R. M., & Deschner, T. (in press). Urinary cortisol increases during a respiratory outbreak in wild chimpanzees. Frontiers in Veterinary Science.
Girard-Buttoz, C., Surbeck, M., Samuni, L., Boesch, C., Fruth, B., Crockford, C., Hohmann, G., & Wittig, R. M. (in press). Variable use of polyadic grooming and its effect on access to social partners in wild chimpanzees and bonobos. Animal Behavior.
Junker, J., Petrovan, S. O., Arroyo-Rodríguez, V., Boonratana, R., Byler, D., Chapman, C. A., Chetry, D., Cheyne, S. M., Cornejo, F. M., Cortés-Ortiz, L., Cowlishaw, G., Christie, A., Crockford, C., de la Torre, S., de Melo, F. R., Fan, P., Grueter, C. C., Guzmán-Caro, D. C., Heymann, E. W., Herbinger, I., Hoang, M. D., Horwich, R. H., Humle, T., Ikemeh, R. A., Imong, I. S., Jerusalinsky, L., Johnson, S. E., Kappeler, P. M., Kierulff, M. C. M., Koné, I., Kormos, R., Le, K. Q., Li, B. G., Marshall, A. J., Meijaard, E., Mittermeier, R. A., Muroyama, Y., Neugebauer, E., Orth, L., Palacios, E., Papworth, S. K., Plumptre, A. J., Rawson, B. M., Refisch, J., Ratsimbazafy, J., Roos, C., Setchell, J. M., Smith, R. K., Sop, T., Schwitzer, C., Slater, K., Strum, S. C., Sutherland, W. J., Talebi, M., Wallis, J., Wich, S., Williamson, E. A., Wittig, R. M., & Kühl, H. S. (in press). Severe Lack of Evidence Limits Effective Conservation of the World’s Primates. Bioscience.
Wittig, R. M., Mielke, A., Lester, J. D., & Crockford, C. (in press). Endurance and flexibility of close social relationships: Comparing chimpanzees (Pan troglodytes verus) and sooty mangabeys (Cercocebusatys atys). In L. M. Hopper, & S. R. Ross (Eds.), Chimpanzees in context: A comparative perspective on chimpanzee behavior, cognition, conservation, and welfare (pp.?). Chicago: The University of Chicago Press.

2020

Eichner, C., Paquette, M., Mildner, T., Schlumm, T., Pleh, K., Crockford, C., Wittig, R. M., Möller, H. E., Friederici, A. D., & Anwender, A. (2020). lncreased Sensitivity and Signal-to-Noise Ratio in Diffusion-Weighted MRI using Multi-Echo Acquisitions. NeuroImage,221: 117172.
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Crockford, C., Samuni, L., Vigilant, L., & Wittig, R. M. (2020). Post-weaning maternal care increases male chimpanzee reproductive success. Sciences Advances,6(38): eaaz5746.
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Crockford, C., Samuni, L., Vigilant, L., & Wittig, R. M. (2020). Postweaning maternal care increases male chimpanzee reproductive success. Science Advances,6(38): eaaaz5746.
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Tkaczynski, P. J., Mielke, A., Samuni, L., Preis, A., Wittig, R. M., & Crockford, C. (2020). Long-term repeatability in social behaviour suggests stable social phenotypes in wild chimpanzees. Royal Society Open Science,7: 200454.
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Mielke, A., Preis, A., Samuni, L., Gogarten, J. F., Lester, J. D., Crockford, C., & Wittig, R. M. (2020). Consistency of social interactions in sooty mangabeys and chimpanzees. bioRxiv.
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Girard-Buttoz, C., Surbeck, M., Samuni, L., Tkaczynski, P. J., Boesch, C., Fruth, B., Wittig, R. M., Hohmann, G., & Crockford, C. (2020). Information transfer efficiency differs in wild chimpanzees and bonobos, but not social cognition. Proceedings of the Royal Society B: Biological Sciences,287(1929): 20200877.
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Bründl, A. C., Tkaczynski, P. J., Kohou, G., Boesch, C., Wittig, R. M., & Crockford, C. (2020). Systematic mapping of developmental milestones in wild chimpanzees (advance online). Developmental Science, e12988.
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Lemoine, S., Boesch, C., Preis, A., Samuni, L., Crockford, C. ǂ., & Wittig, R. M. (2020). Group dominance increases territory size and reduces neighbor pressure in wild chimpanzees. Royal Society Open Science,7(5): 200577.
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Fedurek, P., Tkaczynski, P., Asiimwe, C., Hobaiter, C., Samuni, L., Lowe, A. E., Dijrian, A. G., Zuberbühler, K., Wittig, R. M., & Crockford, C. (2020). Maternal cannibalism in two populations of wild chimpanzees. Primates,61, 181-187.
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Mielke, A., Crockford, C. ǂ., & Wittig, R. M. (2020). Predictability and variability of association patterns in sooty mangabeys. Behavioral Ecology and Sociobiology,74: 46.
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Lemoine, S., Preis, A., Samuni, L., Boesch, C., Crockford, C. ǂ., & Wittig, R. M. (2020). Between-group competition impacts reproductive success in wild chimpanzees. Current Biology,30(2), 312-318.
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Samuni, L., Tkaczynski, P. J., Deschner, T., Löhrrich, T., Wittig, R. M., & Crockford, C. (2020). Maternal effects on offspring growth indicate post-weaning juvenile dependence in chimpanzees (Pan troglodytes verus). Frontiers in Zoology,17: 1.
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Girard-Buttoz, C., Surbeck, M., Samuni, L., Tkaczynski, P. J., Boesch, C., Fruth, B., Wittig, R. M., Hohmann, G., & Crockford, C. (2020). Chimpanzees outperform bonobos at an experimental cooperative task in the wild: Information transfer around a stationary danger. Folia Primatologica,91(3), 255-256.
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Tkaczynski, P. J., Behringer, V., Ackermann, C., Fedrurek, P., Fruht, B., Girard-Buttoz, C., Hobaiter, C., Lee, S., Löhrich, T., Preis, A., Samuni, L., Zommers, Z., Zuberbühler, K., Deschner, T., Wittig, R. M., Hohmann, G., & Crockford, C. (2020). Patterns of urinary cortisol levels during ontogeny appear population- rather than species-specific in wild chimpanzees and bonobos. Journal of Human Evolution,147: 102869.
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Tkaczynski, P. J., Samuni, L., Sonnweber, R., Deschner, T., Vigilant, L., Löhrrich, T., Wittig, R. M., & Crockford, C. (2020). Mum’s the word: The lasting impacts of maternal loss on offspring survival, growth and reproductive success in wild chimpanzees. Folia Primatologica,91(3), 276-277.
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2019

Samuni, L., Mielke, A., Preis, A., Crockford, C. ǂ., & Wittig, R. M. (2019). Intergroup competition enhances chimpanzee (Pan troglodytes verus) in-group cohesion. International Journal of Primatology,41, 342-362.
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Mielke, A., Crockford, C. *., & Wittig, R. M. (2019). Snake alarm calls as a public good in sooty mangabeys. Animal Behaviour,158, 201-209.
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Surbeck, M., Boesch, C., Girard-Buttoz, C., Crockford, C., Hohmann, G., & Wittig, R. M. (2019). Erratum: Comparison of male conflict behavior in chimpanzees (Pan troglodytes) and bonobos (Pan paniscus), with specific regard to coalition and post-conflict behavior. American Journal of Primatology,81(13): e23075.
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Crockford, C. (2019). Why does the chimpanzee vocal repertoire remain poorly understood? - and what can be done about it. In C. Boesch, & R. M. Wittig (Eds.), The chimpanzees of the Taï forest: 40 years of research (pp. 394-409). Cambridge: Cambridge University Press.
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Lemoine, S., Crockford, C., & Wittig, R. M. (2019). Spatial integration of unusually high numbers of immigrant females into the south group further support for the bisexually-bonded model in Tai chimpanzees. In C. Boesch, & R. M. Wittig (Eds.), The chimpanzees of the Taï forest: 40 years of research (pp. 159-177). Cambridge University Press.
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Mielke, A., Crockford, C., & Wittig, R. M. (2019). Rank changes in female chimpanzees in Tai National Park. In C. Boesch, & R. M. Wittig (Eds.), The chimpanzees of the Taï forest: 40 years of research (pp. 290-300). Cambridge University Press.
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Preis, A., Samuni, L., Deschner, T., Crockford, C., & Wittig, R. M. (2019). Group specific social dynamics affect urinary ocytocin levels in Tai male chimpanzees. In C. Boesch, & R. M. Wittig (Eds.), The chimpanzees of the Taï forest: 40 years of research (pp. 339-365). Cambridge: Cambridge University Press.
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Samuni, L., Wittig, R. M., & Crockford, C. (2019). Adoption in the Tai chimpanzees costs, benefits, and strong social relationships. In C. Boesch, & R. M. Wittig (Eds.), The chimpanzees of the Taï forest: 40 years of research (pp. 141-158). Cambridge: Cambridge University Press.
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Dezecache, G., Crockford, C., & Zuberbühler, K. (2019). The development of communication in alarm contexts in wild chimpanzees. Behavioral Ecology and Sociobiology,73(8): 104.
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Eichner, C., Kirilina, E., Paquette, M., Mildner, T., Schlumm, T., Pine, K., Müller-Axt, C., Lipp, I., Möller, H. E., Gallardo, G., Wittig, R. M., Crockford, C., Weiskopf, N., Friederici, A. D., & Anwander, A. (2019). Evolution of white matter connectivity and cortical myelination in hominoids: Wild chimpanzee pilot. In Proceedings of the 25th Annual Meeting of the Organization for Human Brain Mapping (OHBM).
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Samuni, L., Preis, A., Deschner, T., Wittig, R. M., & Crockford, C. (2019). Cortisol and oxytocin show independent activity during chimpanzee intergroup conflict. Psychoneuroendocrinology,104, 165-173.
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Behringer, V., Stevens, J. M. G., Wittig, R. M., Crockford, C., Zuberbühler, K., Leendertz, F. H., & Deschner, T. (2019). Elevated neopterin levels in wild, healthy chimpanzees indicate constant investment in unspecific immune system. BMC Zoology,4: 2.
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Surbeck, M., Boesch, C., Crockford, C., Thompson, M. E., Furuichi, T., Fruth, B., Hohmann, G., Ishizuka, S., Machanda, Z., Muller, M. N., Pusey, A., Sakamaki, T., Tokuyama, N., Walker, K., Wrangham, R., Wroblewski, E., Zuberbühler, K., Vigilant, L., & Langergraber, K. (2019). Males with a mother living in their group have higher paternity success in bonobos but not chimpanzees. Current Biology,29(10), R354-R355.
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Preis, A., Samuni, L., Deschner, T., Crockford, C. ǂ., & Wittig, R. M. (2019). Urinary cortisol, aggression, dominance and competition in wild, West African male chimpanzees. Frontiers im Ecology and Evolution,7: 107.
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Grawunder, S., Crockford, C., Kalan, A. K., Clay, Z., Stoessel, A., & Hohmann, G. (2019). Response to Garcia and Dunn: No evidence that maximum fundamental frequency reflects selection for signal diminution in bonobos Response. Current Biology,29(15), R734-R735.
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2018

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.
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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.
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Grawunder, S., Crockford, C., Clay, Z., Kalan, A. K., Stevens, J. M., Stoessel, A., & Hohmann, G. (2018). Higher fundamental frequency in bonobos is explained by larynx morphology. Current Biology,28(20), R1188-R1189.
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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.
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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.
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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.
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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.
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Crockford, C., Gruber, T., & Zuberbühler, K. (2018). Chimpanzee quiet hoo variants differ according to context. Royal Society Open Science,5(5): 172066.
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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.
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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).
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Lemoine, S., Boesch, C., Crockford, C., & Wittig, R. M. (2018). Selective potential of between-group competition in wild chimpanzees. In N.N.
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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.
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2017

Crockford, C., Wittig, R. M., & Zuberbühler, K. (2017). Vocalizing in chimpanzees is influenced by social-cognitive processes. Science Advances,3(11): e1701742.
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Mielke, A., Samuni, L., Preis, A., Gogarten, J. F., Crockford, C. ǂ., & Wittig, R. M. (2017). Bystanders intervene to impede grooming in Western chimpanzees and sooty mangabeys. Royal Society Open Science,4: 171296.
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Ackermann, C. Y., Neumann, C., Crockford, C., Deschner, T., Wittig, R. M., & Zuberbuehler, K. (2017). Variation in strength of juvenile-mother bonds and oxytocin in wild juvenile chimpanzees. Folia primatologica,88(2), 176.
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Mielke, A., Gogarten, J. F., Preis, A., Samuni, L., Wittig, R. M., & Crockford, C. ǂ. (2017). Bystander effects on grooming interactions in Western Chimpanzees and Sooty Mangabeys. Folia primatologica,88(2), 104-104.
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Samuni, L., Preis, A., Deschner, T., Crockford, C. ǂ., & Wittig, R. M. (2017). Neuroendocrine mechanisms of hunting and food sharing in wild chimpanzees. Folia primatologica,88(2), 103-104.
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Surbeck, M., Boesch, C., Girard-Buttoz, C., Crockford, C., Hohmann, G., & Wittig, R. M. (2017). Comparison of male conflict behavior in chimpanzees (Pan troglodytes) and bonobos (Pan paniscus), with specific regard to coalition and post-conflict behavior. American Journal of Primatology,79(6): e22641.
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Surbeck, M., Girard-Buttoz, C., Boesch, C., Crockford, C., Fruth, B., Hohmann, G., Langergraber, K., Zuberbühler, K., Wittig, R. M., & Mundry, R. (2017). Sex-specific association patterns in bonobos and chimpanzees reflect species differences in cooperation. Royal Society Open Science,4: 161081.
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Ziegler, T., & Crockford, C. (2017). Neuroendocrine control in social relationships in non-human primates: Field based evidence. Hormones and Behavior,91, 107-121.
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Samuni, L., Preis, A., Mundry, R., Deschner, T., Crockford, C. ǂ., & Wittig, R. M. (2017). Oxytocin reactivity during intergroup conflict in wild chimpanzees. Proceedings of the National Academy of Sciences of the United States of America,114(2), 268-273.
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Grawunder, S., Uomini, N., & Crockford, C. (2017). Phonetische und korpus-linguistische Methoden bei der Analyse vokaler Kommunikation von freilebenden Schimpansen im Tai National Forest. In J. Trouvain (Ed.), Elektronische Sprachsignalverarbeitung 2017: Tagungsband der 28. Konferenz Saarbrücken (pp. 33-40). Dresden: TUD Press.
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2016

Wittig, R. M., Crockford, C. *., Weltring, A., Langergraber, K. E., Deschner, T., & Zuberbühler, K. (2016). Social support reduces stress hormone levels in wild chimpanzees across stressful events and everyday affiliations. Nature Communications,7: 13361.
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Crockford, C. (2016). Aging: Lessons for elderly people from monkeys. Current Biology,26(13), R532-R534.
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2015

Cronin, K. A., Pieper, B., van Leeuwen, E. J., Crockford, C. ǂ., & Haun, D. B. (2015). Cooperating to compete: Evaluating behavioral coordination in response to simulated territorial intrusion in chimpanzees (Pan Troglodytes). American Journal of Primatology,77(S1), 64.
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Crockford, C., Wittig, R. M., & Zuberbühler, K. (2015). How intentional are chimpanzee vocalizations? Folia primatologica,86(4), 264-265.
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Crockford, C., Wittig, R. M., & Zuberbühler, K. (2015). An intentional vocalization draws others’ attention: A playback experiment with wild chimpanzees. Animal Cognition,18(3), 581-591.
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Wittig, R. M., Crockford, C. *., Weltring, A., Deschner, T., & Zuberbühler, K. (2015). Single aggressive interactions increase urinary glucocorticoid levels in wild male chimpanzees. PLoS One,10(2): e0118695.
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Crockford, C. (2015). "Nonhuman primate communication, pragmatics, and the origins of language": Comment. Current Anthropology,56(1), 67-67.
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Cheney, D. L., Crockford, C. *., Engh, A. L., Wittig, R. M., & Seyfarth, R. M. (2015). The costs of parental and mating effort for male baboons. Behavioral Ecology and Sociobiology,69(2), 303-312.
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2014

Langergraber, K. E., Rowney, C., Schubert, G., Crockford, C., Hobaiter, C., Wittig, R. M., Wrangham, R. W., Zuberbühler, K., & Vigilant, L. (2014). How old are chimpanzee communities? Time to the most recent common ancestor of the Y-chromosome in highly patrilocal societies. Journal of Human Evolution,69, 1-7.
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Wittig, R. M., Crockford, C. *., Langergraber, K. E., & Zuberbühler, K. (2014). Triadic social interactions operate across time: a field experiment with wild chimpanzees. Proceedings of the Royal Society of London. Series B: Biological Sciences (London),281(1779): 20133155.
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Crockford, C., Deschner, T., Ziegler, T. E., & Wittig, R. M. (2014). Endogenous peripheral oxytocin measures can give insight into the dynamics of social relationships: A review. Frontiers in Behavioral Neuroscience,8: 68.
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Langergraber, K. E., Rowney, C., Crockford, C., Wittig, R. M., Zuberbühler, K., & Vigilant, L. (2014). Genetic analyses suggest no immigration of adult females and their offspring into the Sonso community of chimpanzees in the Budongo Forest Reserve, Uganda. American Journal of Primatology, 640-648.
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Wittig, R. M., Crockford, C. *., Deschner, T., Langergraber, K. E., Ziegler, T. E., & Zuberbühler, K. (2014). Food sharing is linked to urinary oxytocin levels and bonding in related and unrelated wild chimpanzees. Proceedings of the Royal Society B: Biological Sciences,281(1778): 20133096.
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2013

Crockford, C., Wittig, R. M., Langergraber, K., Ziegler, T. E., Zuberbühler, K., & Deschner, T. (2013). Urinary oxytocin and social bonding in related and unrelated wild chimpanzees. Proceedings of the Royal Society B: Biological Sciences,280(1755): 20122765.
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Crockford, C., Wittig, R., & Zuberbühler, K. (2013). Chimpanzees distinguish acoustically similar alert hoos from resting hoos. Folia primatologica,84(3-5), 291-292.
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2012

Langergraber, K., Pruefer, K., Rowney, C., Boesch, C., Crockford, C., Fawcett, K., Inoue, E., Inoue-Muruyama, M., Mitani, J. C., Muller, M. N., Robbins, M. M., Schubert, G., Stoinski, T. S., Viola, B., Watts, D., Wittig, R., Wrangham, R. W., Zuberbühler, K., Pääbo, S., & Vigilant, L. (2012). Generation times in wild chimpanzees and gorillas suggest earlier divergence times in great ape and human evolution. Proceedings of the National Academy of Sciences of the United States of America,109(39), 15716-15721.
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Crockford, C., Wittig, R. M., Mundry, R., & Zuberbühler, K. (2012). Wild chimpanzees inform ignorant group members of danger. Current Biology,22(2), 142-146.
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2010

Silk, J. B., Beehner, J. C., Bergman, T. J., Crockford, C., Engh, A. L., Moscovice, L. R., Wittig, R. M., Seyfarth, R. M., & Cheney, D. L. (2010). Female chacma baboons form strong, equitable, and enduring social bonds. Behavioral Ecology and Sociobiology,54(11), 1733-1747.
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Silk, J. B., Beehner, J. C., Bergman, T. J., Crockford, C., Engh, A. L., Moscovice, L. R., Wittig, R. M., Seyfarth, R. M., & Cheney, D. L. (2010). Strong and consistent social bonds enhance the longevity of female baboons. Current Biology,20(15), 1359-1361.
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Moscovice, L. R., Fiore, A. D., Crockford, C., Kitchen, D. M., Wittig, R. M., Seyfarth, R. M., & Cheney, D. L. (2010). Hedging their bets? Male and female chacma baboons form friendships based on likelihood of paternity. Animal Behaviour,79(5), 1007-1015.
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2009

Silk, J. B., Beehner, J. C., Bergman, T. J., Crockford, C., Engh, A. L., Moscovice, L. R., Wittig, R. M., Seyfarth, R. M., & Cheney, D. L. (2009). The benefits of social capital: Close social bonds among female baboons enhance offspring survival. Proceedings of the Royal Society B: Biological Sciences,276, 3099-3104.
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Kitchen, D., Cheney, D., Seyfarth, R., Beehner, J., Bergman, T., Crockford, C., Engh, A., Fischer, J., & Wittig, R. M. (2009). Costs and consequences of male aggression directed at female chacma baboons. In M. Muller, & R. Wrangham (Eds.), Sexual coercion in primates: An evolutionary perspective on male aggression against females (pp. 128-156). Cambridge, MA: Harvard Univ. Pr.
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2008

Wittig, R. M., Crockford, C. *., Lehmann, J., Whiten, P. L., Seyfarth, R. M., & Cheney, D. L. (2008). Focused grooming networks and stress alleviation in wild female baboons. Hormones and Behavior,54(1), 170-177.
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Boesch, C., Crockford, C. *., Herbinger, I., Wittig, R. M., Möbius, Y., & Normand, E. (2008). Intergroup conflicts among chimpanzees in Taï National Park: Lethal violence and the female perspective. American Journal of Primatology,70(6), 519-532.
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Crockford, C., Wittig, R. M., Whiten, P., Seyfarth, R. M., & Cheney, D. L. (2008). Social stressors and coping mechanisms in wild female baboons (Papio hamadryas ursinus). Hormones and Behavior,53(1), 254-265.
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2007

Wittig, R. M., Crockford, C. *., Wikberg, E., Seyfarth, R. M., & Cheney, D. L. (2007). Kin-mediated reconciliation substitutes for direct reconciliation in female baboons. Proceedings of the Royal Society B: Biological Sciences,274, 1109-1115.
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Wittig, R. M., Crockford, C. *., Seyfarth, R. M., & Cheney, D. L. (2007). Vocal alliances in Chacma baboons (Papio hamadryas ursinus ). Behavioral Ecology and Sociobiology,61(6), 899-909.
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Crockford, C., Wittig, R. M., Seyfarth, R. M., & Cheney, D. L. (2007). Baboons eavesdrop to deduce mating opportunities. Animal Behaviour,73, 885-890.
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2005

Crockford, C., & Boesch, C. (2005). Call combinations in wild chimpanzees. Behaviour,142(4), 397-421.
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2004

Crockford, C., Herbinger, I., Vigilant, L., & Boesch, C. (2004). Wild chimpanzees produce group-specific calls: A case for vocal learning? Ethology,110(3), 221-243.
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Crockford, C. (2004). Vocal communication in West African wild chimpanzees (Pan troglodytes verus): Similarities and differences with humans. PhD Thesis, Univ., Leipzig.
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2003

Crockford, C., & Boesch, C. (2003). Context-specific calls in wild chimpanzees, Pan troglodytes verus: Analysis of barks. Animal Behaviour,66(1), 115-125.
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2000

Crockford, C. (2000). Les chimpanzés du Parc National de Taï utilisent-ils des signaux référentiels ou symboliques? Sempérvira,9, 41-44.
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1994

Crockford, C., & Lesser, R. (1994). Assessing functional communication in aphasia: Clinical utility and time demands of three methods. International Journal of Language & Communication Disorders,29(2), 165-182.
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1992

Crockford C. & Lesser, R. (1992). Assessing functional communication in aphasia: clinical utility and time demands of three methods. European Journal of Communication Disorders. 29:165-182.