De Waal, F. B. M.: The chimpanzee's service economy: food for grooming,
Evol. Hum. Behav., 18, 375–386, 1997.
Feistner, A. T. C. and McGrew, W. C.: Food sharing primates: a critical
review, in: Perspectives in Primate Biology, Vol. 3, Today & Tomorrow
Printers and Publishers, New Delhi, India, 21–36, 1989.
Gilby, I. C.: Meat sharing among the Gombe chimpanzees: harassment and
reciprocal exchange, Anim. Behav., 71, 953–963, https://doi.org/10.1016/j.anbehav.2005.09.009, 2006.
Goffe, A. S., Zinner, D., and Fischer, J.: Sex and friendship in a multilevel
society: behavioural patterns and associations between female and male
Guinea baboons, Behav. Ecol. Sociobiol., https://doi.org/10.1007/s00265-015-2050-6, in press, 2016.
Gomes, C. M. and Boesch, C.: Wild chimpanzees exchange meat for sex on a
long-term basis, PLoS ONE, 4, 5116, https://doi.org/10.1371/journal.pone.0005116, 2009.
Jaeggi, A. V. and Gurven, M.: Natural cooperators: food sharing in humans
and other primates, Evol. Anthropol., 22, 186–195, https://doi.org/10.1002/evan.21364, 2013.
Jones, A. G. and Ratterman, N. L.: Mate choice and sexual selection: what
have we learned since Darwin?, Proc. Natl. Acad. Sci., 106, 10001–10008,
https://doi.org/10.1073/pnas.0901129106, 2009.
Kalbitzer, U., Heistermann, M., Cheney, D., Seyfarth, R., and Fischer, J.:
Variation in aggressiveness and spatial tolerance between male chacma and
Guinea baboons in relation to testosterone and glucocorticoid levels, Horm.
Behav., 75, 100–110, https://doi.org/10.1016/j.yhbeh.2015.08.013, 2015.
Kopp, G. H., Ferreira da Silva, M. J., Fischer, J., Brito, J. C., Regnaut,
S., Roos, C., and Zinner, D.: The influence of social systems on patterns of
mitochondrial DNA variation in baboons, Int. J. Primatol., 35, 210–225,
https://doi.org/10.1007/s10764-013-9725-5, 2014.
Kopp, G. H., Fischer, J., Patzelt, A., Roos, C., and Zinner, D.: Population
genetic insights into the social organization of Guinea baboons (
Papio papio): evidence
for female-biased dispersal, Am. J. Primatol., 77, 878–889, https://doi.org/10.1002/ajp.22415, 2015.
Marlowe, F. W.: A critical period for provisioning by Hadza men, Evol. Hum.
Behav., 24, 217–229, 2003.
Patzelt, A.: The social system of Guinea baboons (
Papio papio) with a focus on
male-male relationships, Doctoral dissertation, Georg-August-Universität
Göttingen, Göttingen, 2013.
Patzelt, A., Kopp, G. H., Ndao, I., Kalbitzer, U., Zinner, D., and Fischer,
J.: Male tolerance and male-male bonds in a multilevel primate society,
P Natl. Acad. Sci., 111, 14740–14745, https://doi.org/10.1073/pnas.1405811111, 2014.
R Core Team: R: A language and environment for statistical computing, R Foundation
for Statistical Computing, Vienna, Austria, 2014.
Silk, J. B., Brosnan, S. F., Henrich, J., Lambeth, S. P., and Shapiro, S.:
Chimpanzees share food for many reasons: the role of kinship, reciprocity,
social bonds and harassment on food transfers, Anim. Behav., 85, 941–947,
https://doi.org/10.1016/j.anbehav.2013.02.014, 2013.
Stevens, J. R. and Gilby, I. C.: A conceptual framework for nonkin food
sharing: timing and currency of benefits, Anim. Behav., 67, 603–614,
https://doi.org/10.1016/j.anbehav.2003.04.012, 2004.
Strum, S. C.: Processes and products of change: baboon predatory behaviour
at Gilgil, Kenya, in: Omnivorous primates: gathering and hunting in human
evolution, Columbia University Press, New York, 255–302, 1981.
Strum, S. C.: Agonistic dominance in male baboons: an alternative view, Int.
J. Primatol., 3, 175–202, 1982.
Swedell, L.: African Papionins: diversity of social organization and
ecological flexibility, in: Primates in Perspective, edited by: Campbell, C.
J., Fuentes, A., MacKinnon, K. C., Panger, M., and Bearder, S. K.,
Oxford University Press, New York, 241–277, 2011.
Swedell, L., Hailemeskel, G., and Schreier, A.: Composition and seasonality
of diet in wild hamadryas baboons: preliminary findings from Filoha, Folia
Primatol. (Basel), 79, 476–490, https://doi.org/10.1159/000164431, 2008.
Teleki, G.: Primate subsistence patterns: collector-predators and
gatherer-hunters, J. Hum. Evol., 4, 125–184, 1975.
Wittig, R. M., Crockford, C., Deschner, T., Langergraber, K. E., Ziegler, T.
E., and Zuberbuhler, K.: Food sharing is linked to urinary oxytocin levels
and bonding in related and unrelated wild chimpanzees, P. Roy. Soc. Lond. B,
281, 20133096, https://doi.org/10.1098/rspb.2013.3096, 2014.
Young, L. J. and Wang, Z.: The neurobiology of pair bonding, Nat. Neurosci.,
7, 1048–1054, https://doi.org/10.1038/nn1327, 2004.
