Fisher Center Publications

Publications

Finestone, E., Bonnie, K.E., Hopper, L.M., Vreeman, V.M., Lonsdorf, E.V., & Ross, S.R. 2014. The interplay between individual, social, and environmental influences on chimpanzee food choices. Behavioural Processes. 105, 71-78.

Lukas, K.E., and Ross, S.R. 2014. A comparison of visitor knowledge and attitudes towards African apes before and after exhibit renovation. Anthrozoos, 27(3): 435-455.

Hopper, L.M. 2014. Do chimpanzees (Pan troglodytes) choose to exert control over their environment to maximize personal gain in comparison to their peers?. American Society of Primatologists Bulletin, Spring/Summer 2014, 43-52.

Pontzer, H., Raichlen, DA, Gordon, AD, Schroepfer, KK, Hare, B, Dunsworth, HM, Wood, BM, Isler, K, Burkart, J, Irwin, M, Shumaker, RW, Lonsdorf, EV, Ross, SR. 2014. Primate Energy Expenditure and Life History. Proceedings of the National Academy of Sciences 111(4): 1433-1437.

Lonsdorf, E.V., Markham, A.C., Heintz, M.R., Anderson, K.E., Ciuk, D.J., Goodall, J., Murray, C.M. 2014. Sex Differences in Wild Chimpanzee Behavior Emerge during Infancy. PLoS ONE 9(6): e99099. doi:10.1371/journal.pone.0099099.

Kurtycz, LM, Wagner, KE and Ross, SR. 2014. The choice to access outdoor areas affects the behavior of zoo-housed great apes. Journal of Applied Animal Welfare Science.17(3):185-97.

Hopper, L.M., Morgan, D.B., & Ross, S.R. 2014. The next direction for primatology? A commentary on Setchell (2013). International Journal of Primatology. 35(2), 341-348.

E. R. Boeving, M. A. Shender, K. E. Wagner, S. R. Ross 2013. A behavioral evaluation of pregnant zoo-housed gorillas (Gorilla gorilla gorilla). American Journal of Primatology. 75(S1), 77.

Chelluri, G.I., Ross, S.R. and Wagner, K.E. 2013. Behavioral correlates and welfare implications of informal interactions between caretakers and zoo-housed chimpanzees and gorillas. Applied Animal Behaviour Science 147: 306-315.

S. E. Henley, M. A. Shender, K. E. Wagner, S. R. Ross 2013. Behavioral development in a new group of bachelor gorillas (Gorilla gorilla gorilla). American Journal of Primatology. 75(S1), 77.

L. M. Kurtycz, M. A. Shender, S. R. Ross 2013. Changes in western lowland gorillas (Gorilla gorilla gorilla) group cohesion following the birth of a baby. American Journal of Primatology. 75(S1), 89.

L. M. Hopper, S. P. Lambeth, S. J. Schapiro, S. F. Brosnan 2013. Chimpanzees (Pan troglodytes) attempt to maximize returns, not “level the playing field”. American Journal of Primatology. 75(S1), 43.

Bryne RW, Sanz CM and Morgan DB 2013. Chimpanzees plan their tool use. In: Sanz CM, Call J, Boesch C (eds), Tool use in animals. Cambridge University Press, Cambridge UK.

Brosnan, S.F. & Hopper, L.M. 2013. Cooperation, behavioral diversity and inequity responses. In M. Banaji & S. Gelman (Eds.) Navigating the Social World: What Infants, Children, and Other Species Can Teach Us. Oxford University Press: New York, NY.

Freeman, H.D., Brosnan, S.F., Hopper, L.M., Lambeth, S.P., Schapiro, S.J. & Gosling, S.D. 2013. Developing a comprehensive and comparative questionnaire for measuring personality in chimpanzees using a simultaneous top-down/bottom-up design. American Journal of Primatology, 75: 1042-1053.

Freeman, H.D., Sullivan, J., Hopper, L.M., Talbot, C.F., Holmes, A.N., Schultz-Darken, N., Williams, L.E. & Brosnan, S.F. 2013. Different responses to reward comparisons by three primate species. PLoS ONE 8(10): e76287.

Ross, M.R., Gillespie, K.L., Hopper, L. M., Bloomsmith, M.A., & Maple, T.L. 2013. Differential preference for ultraviolet light among captive birds from three ecological habitats. Applied Animal Behaviour Science 147: 278-285.

Hopper, L.M., Holmes, A.N., Williams, L.E., & Brosnan, S.F. 2013. Dissecting the mechanisms of squirrel monkey (Saimiri boliviensis) social learning. PeerJ 1:e13. DOI: 10.7717/peerj.13.

K.E. Wagner, S. R. Ross 2013. Female sexual state influences the cognitive test performance of zoo-living chimpanzees (Pan troglodytes) but not gorillas (Gorilla gorilla gorilla). American Journal of Primatology. 75(S1), 44.

Morgan, D., Sanz, C., Greer, D., Rayden, T., Maisels, F. & Williamson, E.A. 2013. Great Apes and FSC: Implementing ‘Ape Friendly’ Practices in Central Africa’s Logging Concessions. Gland, Switzerland: IUCN/SSC Primate Specialist Group. 36 pp.

M. H. Brown, M. A. Shender, K. E. Wagner, S. R. Ross 2013. Potential factors associated with stereotyped ear-covering behavior in an adolescent male gorilla (Gorilla gorilla gorilla). American Journal of Primatology. 75 (S1), 49.

Ross, S.R. 2013. Preface to the Special Issue on the Welfare of Zoo Animals. Applied Animal Behaviour Science 147: 306-315.

Ross, S.R. 2013. Questioning the use of privately-owned apes in Anthropological Research. American Journal of Physical Anthropology, 152: 313-314.

C. F. Talbot, A. E. Parrish, H. D. Freeman, L. Hopper, K. Leverett, A. N. Holmes, L. E. Williams, S. F. Brosnan. 2013. Social and individual comparisons are influenced by context. American Journal of Primatology. 75(S1), 98.

L. M. Hopper, K. E. Bonnie, L. M. Kurtycz, S. R. Ross 2013. Testing for chimpanzee innovation and social learning in a zoo setting. American Journal of Primatology. 75(S1), 56.

M. A. Shender, S. R. Ross 2013. The effects of available space on a group of captive gorillas (Gorilla gorilla gorilla) and chimpanzees (Pan troglodytes) living in a naturalistic zoo-setting. American Journal of Primatology. 75(S1), 51.

Hopper, L.M., Lambeth, S.P., Schapiro S.J., Bernacky, B.J., & Brosnan, S.F. 2013. The ontogeny of social comparisons in rhesus macaques (Macaca mulatta). Journal of Primatology, 2:109.

H. D. Freeman, S. R. Ross 2013. The relationship between early human exposure and current behavior in former pet/performer chimpanzees (Pan troglodytes). American Journal of Primatology. 75(S1), 46.

Sanz, S., Morgan, D. 2013. The social context of chimpanzee tool use. In: Sanz, C., Call, J., Boesch, C. (Eds.), Tool use in animals. Cambridge University Press, Cambridge UK.

Hopper, L.M., Lambeth, S.P., Schapiro, S.J. & Brosnan S.F. 2013. When given the opportunity, chimpanzees maximize personal gain rather than “level the playing field”. PeerJ. 1: e165.

B. I. Neier, D. Boyer, K. E. Lukas, S. R. Ross 2013. Wounding rates in bachelor and mixed-sex grouping of lowland gorillas (Gorilla gorilla gorilla). American Journal of Primatology. 75(S1), 61.

Hopper, L.M., Lambeth, S.P. & Schapiro, S.J. 2012. An evaluation of the efficacy of video displays for use with chimpanzees (Pan troglodytes). American Journal of Primatology. 74, 442-449.

Wagner, K.E., and Ross, S.R. 2012. Association between cognitive test performance and disposition to arousal in chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla). American Journal of Primatology, 74 S1: 66.

Fitzpatrick, M.C., Wagner K.E., Ross S.R. 2012. Behavioral changes associated with sexual state in zoo-living chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla). American Journal of Primatology, 74 S1: 39.

Jean, S.M., Preuss, T., Stobert, E., Anderson, D., Sharma, P., Ross, S.R., Stroud, F.C. 2012. Case Report: Cerebrovascular Accident (Stroke) in Captive, Group-Housed, Female Chimpanzees. Comparative Medicine, 62 (4): 1-8.

Finestone, E.M., Bonnie, K.E., Vreeman, V.M., Ross, S.R., Lonsdorf, E.V. 2012. Chimpanzee (Pan troglodytes) food selections differ between solitary and social conditions. American Journal of Primatology, 74 S1: 61.

Caldwell. C.A., Schillinger, K., Evans, C.L., & Hopper, L.M. 2012. End state copying by humans (Homo sapiens): Implications for a comparative perspective on cumulative culture. Journal of Comparative Psychology. 126, 161-169.

Ross, S.R., and Anderson, K.E. 2012. Estimating daily travel distances for captive apes. American Journal of Primatology, 74 S1: 35.

Bonnie, K, Ross, SR, and Lonsdorf, EV. 2012. Flexibility and persistence of chimpanzee (Pan troglodytes) foraging behavior in a captive environment. American Journal of Primatology, 74: 661-668.

Morgan, D.B., Sanz, C.M., Onononga, J.R., Eyana Ayina, C., Strindberg, S. 2012. Great Apes and Mechanized Logging in the Kabo Concession. In Clark, C. J. and Poulsen, J. R. (Eds.). Tropical Forest Conservation and Industry Partnership: An Experience from the Congo Basin Conservation Science and Practice. Conservation and Science Practice, Wiley-Blackwell.

Shender, M.S., Anderson, K.E., Ross, S.R. 2012. Group cohesion in captive gorillas (Gorilla gorilla gorilla) and chimpanzees (Pan troglodytes) living in a naturalistic zoo exhibit. American Journal of Primatology, 74 S1: 75.

Vallo, P., Petrželková, K.J., Profousová, I., Petrášová, J., Pomajbíková, K., Leendertz, F., Hashimoto, C., Simmons, N., Babweteera, F., Machanda, Z., Piel, A., Robbins, M., Boesch, C., Sanz, C., Morgan, D., Sommer, V., Furuichi, T., Fujita, S., Matsuzawa, T.H., M.A., Modrý, D. 2012. Molecular diversity of entodiniomorphid ciliate Troglodytella abrassarti and evaluation of its coevolution with chimpanzees. American Journal of Physical Anthropology.

Hopper, L.M. & Brosnan, S.F. 2012. Primate cognition. Nature Education Knowledge 3(6):1.

Hopper, L.M., Marshall-Pescini, S. & Whiten, A. 2012. Social learning and culture in child and chimpanzee. In F.B.M. de Waal & P.F. Ferrari (Eds.) The Primate Mind: Built to Connect with Other Minds. (pp. 99-118). Harvard University Press: Cambridge, MA.

Lonsdorf, EV and Ross, SR 2012. Socialization and Development of Behavior. In: Mitani J, Call J, Kappeler P, Palombit R, and Silk J (eds) The Evolution of Primate Societies. University of Chicago Press. pp.245-268.

Ségurel, L, EE Thompson, T Flutre, J Lovstad, A Venkat, SW Margulis, J Moyse, SR Ross, K Gamble, G Sella, C Ober, M Przeworski. 2012. The ABO blood group is a trans-species polymorphism in primates. Proceedings of the National Academy of Sciences, 109 (45) 18493-18498.

Hopper, L.M. & Whiten, A. 2012. The evolutionary and comparative psychology of social learning and culture. In J. Vonk & T. K. Shackelford (Eds.) The Oxford Handbook of Comparative Evolutionary Psychology. (pp.451-473). Oxford University Press: New York, NY.

Morgan, D.B., Sanz, C.M., Stokes, E.J. 2012. The Importance of Set Aside Areas for the Conservation of Great Apes in the Ndoki Region: Preservation of the Goualougo and Djeke Triangle Forests. In Clark, C. J. and Poulsen, J. R. (Eds.). Tropical Forest Conservation and Industry Partnership: An Experience from the Congo Basin Conservation Science and Practice. Conservation and Science Practice, Wiley-Blackwell.

Heggs, L.E., Matheson, M., Ross, S.R., Mulcahy, J.B. 2012. The influence of a novel outdoor environment on the behavior of captive chimpanzees (Pan troglodytes) in a sanctuary setting. American Journal of Primatology, 74 S1: 36.

Meulman, E. J. M., Sanz, C. M., Visalberghi, E., van Schaik, C. P. 2012. The role of terrestriality in promoting primate technology. Evolutionary Anthropology 21(2): 58-68.

Lonsdorf, E.V., Murray, C.M., Lonsdorf, E.V., Travis, D.A, Gilby, I.C., Chosy, J., Goodall, J., Pusey A.E. 2011. A retrospective analysis of factors correlated to chimpanzee (Pan troglodytes schweinfurthii) respiratory health at Gombe National Park. Ecohealth.

Kurtycz, LM, Wagner, KE, Ross, SR, Lonsdorf, EV. 2011. Behavioral effects of providing a choice for outdoor access to captive gorillas (Gorilla gorilla gorilla). American Journal of Primatology, 73(S1): 68.

Jacobsen, K.R., Hopper, L.M., McAdams, T., Merino, R., Sherenco, K., Lambeth, S.P., & Schapiro, S.J. 2011. Characterization of alopecia in four species of non-human primates. American Journal of Primatology. 73(S1), 81.

Hopper, LM, Lambeth, SP, Schapiro, SJ, and Brosnan, SF. 2011. Chimpanzees’ (Pan troglodytes) learning indicates both conformity and conservatism. American Journal of Primatology, 73 (S1): 77.

Hopper, L.M., Lambeth, S.P., Schapiro, S.J., & Brosnan, S.F. 2011. Chimpanzees’ (Pan troglodytes) learning indicates both conformity and conservatism. American Journal of Primatology. 73(S1), 77.

Hopper, L.M., Schapiro, S.J., Lambeth, S.P. & Brosnan, S.F. 2011. Chimpanzees’ socially maintained food preferences indicate both conservatism and conformity. Animal Behaviour. 81, 1195-1202.

Sanz, C., Morgan D.B. (2011). Elemental variation in the termite fishing of wild chimpanzees (Pan troglodytes). Biological Letters, DOI: 10.1098/rsbl.2011.0088. 2011. Elemental variation in the termite fishing of wild chimpanzees (Pan troglodytes). .

Hopkins, WD, Phillips, KA, Bania, A, Calcutt, SE, Gardner, M, Russell, J, Schaeffer, J, Lonsdorf, EV, Ross, SR, and Schapiro, SJ. 2011. Hand Preferences for Coordinated Bimanual Actions in 777 Great Apes: Implications for the Evolution of Handedness in Hominids. Journal of Human Evolution, 60: 605-611.

Lonsdorf, E V, S. M. Shuster, M. Lau and T. G. Whitham. 2011. How tangled is the bank? Effective community diversity and the opportunity for ecologically-dependent selection. In Review. Evolution.

Anderson, K.E., and Ross, S.R. 2011. Methods and preliminary results for the social space of captive chimpanzees. Annual meeting of the Midwestern Primate Interest Group, Cleveland, OH, September 2011.

Freeman, H, Gosling, S, Schapiro, SJ. 2011. Methods for assessing personality in non-human primates. In A. Weiss, J. King, & L. Murray (Eds.), Personality and Behavioral Syndromes in Nonhuman Primates. New York: Springer.

Faust, LJ, Cress, D, Farmer, K, Ross, S.R., Beck, B. 2011. Predicting Capacity Demand on African Chimpanzee Sanctuaries. International Journal of Primatology, 32:849-864.

Ross, S. R., Calcutt, S. E., Schapiro, S. and Hau, J. 2011. Space use selectivity by chimpanzees and gorillas in an indoor-outdoor enclosure. American Journal of Primatology. 73: 197-208.

Ross, SR, Vreeman, VM, Lonsdorf, EV. 2011. Specific Image Characteristics Influence Attitudes about Chimpanzee Conservation and Use as Pets. PLoS ONE 6(7): e22050. doi:10.1371/journal.pone.0022050.

Talbot, CF, Freeman, H, Williams, LE, Brosnan, SF. 2011. Squirrel monkeys’ response to inequitable outcomes indicates a behavioural convergence within the primates. Biology Letters, 7(5): 680-682.

Ross, S.R., Wagner, K.E., Schapiro, S.J., Hau, J., and Lukas, K.E. 2011. Transfer and acclimatization effects on the behavior of two species of African great ape moved to a novel and naturalistic zoo environment. International Journal of Primatology, 32: 99-117.

Heintz, M.R., Santymire, R.M., Parr, L.A., Lonsdorf, E.V. 2011. Validation of cortisol enzyme immunoassay and characterization of salivary cortisol circadian rhythm in chimpanzees (Pan troglodytes). American Journal of Primatology, 73: 1-6.

Gillespie, T.R., Morgan, D., Deutsch, J. C., Kuhlenschmidt, M. S., Salzer, J. S., Cameron, K., Reed, T., Sanz, C.   2010. A Legacy of Low-Impact Logging does not Elevate Prevalence of Potentially Pathogenic Protozoa in Free-Ranging Gorillas and Chimpanzees in the Republic of Congo: Logging and Parasitism in African Apes. EcoHealth, 6: 557-564.

Wallis, J. and Lonsdorf, E.V. 2010. A summary of recommendations for primate conservation education. American Journal of Primatology, 72: 441-444.

Wagner, K.E. and Ross, S.R. 2010. Advances in the use of computerized technology in ape cognitive research. American Journal of Primatology, 72: S1: 67.

Ross, S.R., Wagner, K.E., Schapiro, S.J., and Hau, J. 2010. Ape behavior in two alternating environments: comparing exhibit and short-term holding areas. American Journal of Primatology. 71: 1-9.

Fenn, T.E., S.R. Ross, K. Wagner. 2010. Behavioral effects of female immigration on solitary and bachelor group male gorillas (Gorilla gorilla gorilla). American Journal of Primatology, 72: S1: 71.

Meguerditchian, A., Calcutt, S.E., Lonsdorf, E.V., Ross, S.R., and Hopkins, W.D. 2010. Captive gorillas are right-handed for bimanual feeding. American Journal of Physical Anthropology, 141: 638-645.

Ross, S.R. 2010. Chimpanzee (Pan troglodytes) Care Manual. Association of Zoos and Aquariums, Silver Spring, MD.

Lonsdorf, E.V. 2010. Chimpanzee mind, behavior and conservation. In: Lonsdorf, E.V., Ross, S.R. and Matsuzawa, T. (eds) The Mind of the Chimpanzee: Experimental and Ecological Perspectives. University of Chicago Press.

Sanz, C., Schöning, C. Morgan, D. 2010. Chimpanzees prey on army ants with specialized tool set. American Journal of Primatology, 71:1–8.

Sanz, C., Morgan, D. B. 2010. Complexity of chimpanzee tool using behaviors. In: The Mind of the Chimpanzee: Ecological and Experimental Perspectives (Ed. by Lonsdorf, E. V., Ross, S. R. & Matsuzawa, T.. Chicago, IL: University of Chicago Press. pp. 127-140.

Truitt, A and Ross, SR. 2010. Current legislative challenges facing chimpanzee sanctuaries in the United States. American Journal of Primatology, 72 (S1): 49.

Hopper, L.M. 2010. Deferred imitation in children and apes. Children imitate after a delay, but can apes ape in a similar fashion?. The Psychologist. 23, 294-297.

Ross, S.R., Wagner, K.E., Schapiro, S.J. and Hau, J. 2010. Differential ape behavior in two alternating environments: Comparing behavior in exhibit and short-term holding spaces. American Journal of Primatology, 72: 951-959.

Ross, S.R., Ross, M.R., and Clark, A.B. 2010. Ethosearch: A comprehensive repository of ethograms for use in animal behavior research. Proceedings of the 7th International Conference on Methods and Techniques in Behavioral Research, 369 (abstract).

Milstein, M.S., S. E. Calcutt, S. R. Ross, K. E. Bonnie, E. V. Lonsdorf. 2010. Food-sharing in a variable environment among a group of zoo-housed chimpanzees (Pan troglodytes). American Journal of Primatology, 72: S1: 70.

Freeman, H and Beer, J. 2010. Frontal Lobe Activation Mediates the Relation Between Sensation-Seeking and Cortisol Increases. Journal of Personality, 1497-1528.

Ross, S.R. 2010. How cognitive studies help shape our obligation for the ethical care of chimpanzees. University of Chicago Press.

Rudicell, R. S., Jones, J.H., Wroblewski, E.E., Learn, G. H., Li, Y., Robertson, J., Greengrass, E., Grossmann, F., Kamenya, S., Pintea, L., Mjungu, D.C., Lonsdorf, E.V., Mosser, A., Lehman, C., Collins, D.A., Keele, B.F., Goodall, J., Pusey, A.E., Hahn, B., Wilson, M.L. 2010. Impact of Simian Immunodeficiency Virus Infection on chimpanzee population dynamics. PLoS Pathogens, 6(9): e1001116.

Neel, C., Etienne, L., Li, Y. Y., Takehisa, J., Rudicell, R. S., Bass, I. N., Moudindo, J., Mebenga, A., Esteban, A., Van Heuverswyn, F., Liegeois, F., Kranzusch, P. J., Walsh, P. D., Sanz, C. M., Morgan, D. B., Ndjango, J. B. N., Plantier, J. C., Locatelli, S., Gonder, M. K., Leendertz, F. H., Boesch, C., Todd, A., Delaporte, E., Mpoudi-Ngole, E., Hahn, B. H. Peeters, M. 2010. Molecular Epidemiology of Simian Immunodeficiency Virus Infection in Wild-Living Gorillas. Journal of Virology, 84(3): 1464-1476.

Blinkova, O, Victoria, J, Li, Y, Keele, BF, Sanz, C, Ndjango, JBN, Peeters, M, Lonsdorf, EV, Travis, DA, Wilson, MW, Pusey, AE, Hahn, BH, and Delwart, EL. 2010. Novel circular DNA viruses in stool samples of wild-living chimpanzees. Journal of General Virology, 91: 74-86.

Hopper, L.M., Flynn, E., Wood, L.A.N. & Whiten, A. 2010. Observational learning of tool use in children: Investigating cultural spread through diffusion chains and learning mechanisms through ghost displays. Journal of Experimental Child Psychology. 106, 82-97.

Lonsdorf, E.V. and Bonnie, K.B. 2010. Opportunities and constraints when studying social learning: developmental approaches and social factors. Learning and Behavior, 38: 195-205.

Liu, W., Li, Y., Learn, G. H., Rudicell, R. S., Robertson, J. D., Ndjango, J. B. N., Sanz, C. M., Morgan, D. B., Locatelli, S., Gonder, M. K., Kranzusch, P. J., Walsh, P. D., Delaporte, E., Mpoudi-Ngolle, E., Georgiev, A. V., Muller, M. N., Shaw, G. M., Peeters, M., Sharp, P. M., Rayner, J. C., Hahn, B. H. 2010. Origin of the human malaria parasite Plasmodium falciparum in western gorillas (Gorilla gorilla). Nature, 467: 420-427.

Freeman, H, Gosling, S. 2010. Personality in non-human primates: A review and evaluation of past research. American Journal of Primatology. 71: 1-19.

Ross, S.R., Milstein, M.S., Calcutt, S.E., Lonsdorf, E.V. 2010. Preliminary assessment of methods used to demonstrate nut cracking behavior to five captive chimpanzees (Pan troglodytes). Folia Primatologica, 81: 224-232.

Horner, V, Proctor, D, Bonnie, KE, Whiten, A and de Waal, FBM. 2010. Prestige affects cultural learning in chimpanzees. PLoS ONE, 5(5): e10625. doi: 10.1371/journal.prone.0010625.

Ross, S.R., and Vreeman, V.M. 2010. Project ChimpCARE: An assessment of privately-owned chimpanzees in the United States. American Journal of Primatology, 72: S1: 48.

Ross, S.R. 2010. Research, advocacy and conservation efforts on behalf of chimpanzees: How American zoos are strengthening their commitment to the species. Proceedings of the 15th Kyoto University International Symposium (COP10 Partnership Program): Biodiversity, Zoos and Aquariums: The Message from Animals, 28 (abstract).

Ross, S.R. 2010. The challenges facing chimpanzee sanctuaries. American Journal of Primatology, 72: S1: 48.

Lonsdorf, E.V., Ross, S.R. and Matsuzawa, T. (eds).  2010. The Mind of the Chimpanzee: Experimental and Ecological Perspectives. University of Chicago Press.

Parr, L.A, Heintz, M., Lonsdorf, E.V., Wroblewski, E. 2010. Visual kin recognition in nonhuman primates: inbreeding avoidance or male distinctiveness. Journal of Comparative Psychology, 4: 343-350.

Hopper, L.M. 2010. ‘Ghost’ experiments and the dissection of social learning in humans and animals. Biological Reviews. 85, 685-701.

Calcutt, S., Milstein, M. Ross, S.R., Lonsdorf, E.V. 2009. Acquisition of nut-cracking behaviors in a group of zoo-living chimpanzees (Pan troglodytes). American Journal of Primatology, 71, Supplement 1: 49.

Lonsdorf, E.V., Ross, S.R., Linick, S.A., Milstein, M.S. and Melber, T.N. 2009. An experimental, comparative investigation of tool use in chimpanzees and gorillas. Animal Behaviour, 77: 1119-1126.

Sanz, C., Call, J., and Morgan, D.  2009. Design complexity in termite-fishing tools of chimpanzees (Pan troglodytes). Biology Letters, 5: 293-296.

Whiten, A., McGuigan, N., Marshall-Pescini, S. & Hopper, L.M. 2009. Emulation, imitation, over-imitation and the scope of culture for child and chimpanzee. Philosophical Transactions of the Royal Society B. 364, 2417-2428.

Milstein, M.S., Lonsdorf, E.V. Ross, S.R., Bonnie, K.E., and Calcutt, S. 2009. Extractive tool-use by a group of zoo-housed chimpanzees (Pan troglodytes) in an variable environment: preliminary evidence of persistent strategies. American Journal of Primatology, 71, Supplement 1: 82.

Sanz, C. M. and Morgan, D. B. 2009. Flexible and Persistent Tool-using Strategies in Honey-gathering by Wild Chimpanzees. International Journal of Primatology, 30: 411-427.

de Waal, FBM, Bonnie, KE. 2009. In tune with others: the social side of primate culture. In The Question of Animal Culture (K.N. Laland & B. G. Galef, Eds.) Cambridge, MA: Harvard University Press.

Keele, B.F, Jones, J.H. , Terio, K.A., Estes, J.D., Rudicell, R.S., Wilson, M.L., Li, Y., Learn, G.H., Beasley, T.M., Schumacher-Stankey, J., Wroblewski, E., Mosser, A., Raphael, J., Kamenya, S., Lonsdorf, E.V., Travis, D.A., Mlengeya, T., Kinsel, M.J., Else, J.G., Silvestri, G., Goodall, J., Sharp, P.M., Shaw, G.M., Pusey, A.E., Hahn, B.H. 2009. Increased Mortality and AIDS-like Immunopathology in Wild Chimpanzees Infected with SIVcpz. Nature, 460: 515-519.

Ross, S.R. and Gillespie, K. 2009. Influences on visitor behavior at a modern immersive zoo exhibit. Zoo Biology 28(5): 462-472..

Ross, S.R., Lonsdorf, E.V., and Holmes, A.N. 2009. Interactions between indigenous wildlife and four species of zoo-housed apes in North America: Patterns of aggression and hunting. American Journal of Primatology, 71, Supplement 1: 34.

Ross, S.R., Lonsdorf, E.V., and Holmes, A.N. 2009. Interactions Between Zoo-Housed Great Apes and Local Wildlife. American Journal of Primatology, 71: 458-465.

Wroblewski, E.E., Murray, C.M., Keele, B.F., and Schumacher-Stankey, J.C. 2009. Male dominance rank and reproductive success in chimpanzees, Pan troglodytes schweinfurthii. Animal Behaviour, 77:873-885.

Murray, C.M., Lonsdorf, E.V., Eberly, L., and Pusey, A.E. 2009. Reproductive energetics in free-living female chimpanzees (Pan troglodytes). Behavioral Ecology, 20: 1211-1216.

Wagner, K.E. and S.R. Ross. 2009. Sequencing performance and error trends in gorillas (Gorilla gorilla gorilla) and chimpanzees (Pan troglodytes). American Journal of Primatology, 71, Supplement 1: 35.

Ross, S.R. 2009. Sequential list-learning by an adolescent lowland gorilla (Gorilla gorilla gorilla) using an infrared touchframe apparatus. Interaction Studies 10(2): 115-129.

Ross, S.R., Schapiro, S.J., Hau, J., and Lukas, K.E. 2009. Space use as an indicator of enclosure appropriateness: A novel measure of captive animal welfare. Applied Animal Behaviour Science, 121: 42-50.

Ross, S.R., Bloomsmith, M.A., Bettinger, T.M., and Wagner, K.E. 2009. Wounding patterns in adolescent male chimpanzees: management and welfare implications. Zoo Biology, 28: 623-634.

Milstein, MS, Lonsdorf, EV, Ross, SR and Linick SA. 2008. A comparison between chimpanzee (Pan troglodytes) and gorilla (Gorilla gorilla gorilla) social tolerance at an artificial termite mound. American Journal of Primatology, 70:58.

Travis, D., Lonsdorf, E.V., Mlengeya, T., Raphael, J. 2008. A science-based approach to managing disease risks for ape conservation. American Journal of Primatology, 70: 766-777.

Wagner, K.E. and Ross, S.R. 2008. Association between self-directed behaviors and performance in a cognitive sequencing task in a female chimpanzee. American Journal of Primatology, 70:55.

Margulis, S.W. 2008. Book review: Gorilla Society: Conflict, Compromise, and Cooperation Between the Sexes. American Journal of Physical Anthropology, 137: 241.

Williams, J.M., Lonsdorf, E.V., Wilson, M.L., Schumacher-Stankey, J., Goodall, J, Pusey, A. E. 2008. Causes of death in the Kasekela chimpanzees of Gombe National Park, Tanzania. American Journal of Primatology, 70: 745-750.

Wagner, K. and Ross, S.R. 2008. Chimpanzee (Pan troglodytes) birth patterns and human presence in zoological settings. American Journal of Primatology, 70: 1-4.

Ross, S.R. and Wagner, K.E. 2008. Differential behavior patterns in zoo-housed apes between exhibits and holding: Effects on welfare assessment. American Journal of Primatology, 70:41.

Cantalupo, C, Freeman, H, Rodes, W, Hopkins, WD. 2008. Handedness for Tool Use Correlates with Cerebellar Asymmetries in Chimpanzees (Pan troglodytes). Behavioral Neuroscience.122: 191-198.

Ross, S.R., Lukas, K.E., Lonsdorf, E.V., Stoinski, T.S., Hare, B., Shumaker, R. and Goodall, J. 2008. Inappropriate Use and Portrayal of Chimpanzees. Science, 319: 1487.

Losin, EA, Russell, JL, Freeman, H, Meguerditchian, A, and Hopkins, WD. 2008. Left hemisphere specialization for oro-facial movements of learned vocal signals by captive chimpanzees. PlosONE. 3: 1-7.

Arnoczky, SP, Lavagnino, M, Egerbacher, M, Caballero, O, Gardner, K, and Shender, MA. 2008. Loss of homeostatic strain alters mechanostat “set point” of tendon cells in vitro. Clinical Orthopedic Related Research, 466 (7): 1583-1591.

Foster, M.W., Linick, S.A., Milstein, M.S., Wagner, K.E., Margulis, S.W., Ross, S.R., and Lonsdorf, E.V.  2008. Motivating a new generation of primatologists: the Lincoln Park Zoo's Exploring Ape Behavior Program. American Journal of Primatology, 70:38.

Hopper, L.M., Lambeth, S.P., Schapiro, S.J. & Whiten, A. 2008. Observational learning in chimpanzees and children studied through ‘ghost’ conditions. Proceedings of the Royal Society B. 275, 835–840.

Ross, S.R., Wagner, K.E., Lonsdorf, E.V. 2008. Preliminary evidence for sequential list-learning by a western lowland gorilla (Gorilla gorilla gorilla): Performance measures and analysis of errors. Primate Eye, 96.

Margulis, S. and Atsalis, S.  2008. Primate Reproductive Aging: Cross-Taxon Perspectives. .

Linick, S.A., Lonsdorf, E.V., Ross, S.R., and Milstein M.S. 2008. The development of termite-fishing skills in captive Western lowland gorilla infants (Gorilla gorilla gorilla). American Journal of Primatology, 70:58.

Freeman, H, Gosling, S, Lambeth, S, Dickey, A, Schapiro, S. 2007. A behavioral assessment and correlates of novelty seeking in chimpanzees (Pan troglodytes). American Journal of Primatology, 69(S1): 112.

Ross, S.R., Lonsdorf, E.V. and T.S. Stoinski. 2007. Assessing the welfare implications of visitors in a zoo setting: A comment on Wells (2005). Applied Animal Behaviour Science, 102: 130-133.

Margulis, S.W., Atsalis, S., Bellem, A., Wielebnowski, N. 2007. Assessment of reproductive behavior and hormonal cycles in geriatric Western Lowland gorillas. Zoo Biology, 26: 117-139.

Morgan, D.B. and Sanz, C.M. 2007. Best Practice Guidelines for Reducing the Impact of Commercial Logging on Great Apes in Western Equatorial Africa. Gland, Switzerland: IUCN SSC Primate Specialist Group (PSG). 32 pp.

Beck, B., Walkup, K., Rodrigues, M., Unwin, S., Travis, D. and Stoinski, T. 2007. Best Practice Guidelines for the Re-introduction of Great Apes. IUCN/SSC Primate Specialist Group, Gland, Switzerland.

Sanz, C.M. and Morgan, D.B. 2007. Chimpanzee tool technology in the Goualougo Triangle, Republic of Congo. Journal of Human Evolution, 52(4): 420-433.

Sanz, C.M, Morgan, D.B., Strindberg, S., and Onononga, J.R. 2007. Distinguishing between the nests of sympatric chimpanzees and gorillas. Journal of Applied Ecology, 44(2): 263-272.

Vreeman, V.M. and Ross, S.R. 2007. Do seasonal changes affect activity in captive chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla) living in a northern zoo?. American Journal of Primatology 69 (supplement 1): 89.

Hopper, L.M., Spiteri, A., Lambeth, S.P., Schapiro, S.J., Horner, V. & Whiten, A. 2007. Experimental studies of traditions and underlying transmission processes in chimpanzees. Animal Behaviour.73, 1021-1032.

Halloran, A.R., Broadfield, D., Ross, S.R. and Marshall, A. 2007. Exploring diachronic change in the group specific vocalizations of chimpanzees (Pan troglodytes). American Journal of Physical Anthropology (Suppl 44): 123-124.

Hopkins, WD, Russel, J, Remkus, M, Freeman, H, & Schapiro, SJ. 2007. Handedness and grooming in chimpanzees (Pan troglodytes): Comparative analysis between findings in captive and wild individuals. International Journal of Primatology, 28, 1315-1326.

Walsh, P.D., Breuer,T., Sanz, C.M., Morgan, D.B., and Doran-Sheehy, D. 2007. Potential for Ebola transmission between gorilla and chimpanzee social groups. American Naturalist, 169(5): 684-689.

Melber, T.M., Lonsdorf, E.V. and Ross, S.R. 2007. Social learning of tool-use skills in captive chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla). American Journal of Primatology 69 (supplement 1): 100-101.

Lonsdorf, E.V. 2007. The Role of Behavioral Research in the Conservation of Chimpanzees and Gorillas. Journal of Applied Animal Welfare Science, 10(1): 71-78.

Freeman, H, Gosling, S. 2006. A review and meta-analysis of personality studies in non-human primates. American Journal of Primatology 68 (S1): 75.

Lonsdorf, E.V., Ross, S.R. and Melber, T.N. 2006. An experimental, comparative approach to social learning of tool-use skills in chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla gorilla). International Journal of Primatology (supplement 1): 27.

Ross, S.R. and Lukas, K.E. 2006. Attitudes and knowledge of visitors towards African apes at a North American Zoo. International Journal of Primatology (supplement 1): 27.

Cranfield, M., Gaffikin, L., Minnis, R., Nutter, F., Rwego, I., Travis, D. and Whittier, C. 2006. Clinical Response to Decision Tree for the Mountain Gorilla (Gorilla beringeii) as a Model for Great Apes. American Journal of Primatology: Special Topics Issue, 68: 909-927.

Bloomsmith, M.A., Ross, S.R., Bettinger, T., Clay, A.W. and Anderson, U. 2006. Cross-sectional study of the behavioral development of young male chimpanzees in twenty zoos. American Journal of Primatology 68 (supplement 1): 48.

Travis, D.A., Hungerford, L., Engel, G.A., and Jones-Engel, L.  2006. Disease Risk Analysis: A Tool for Primate Conservation Planning and Decision Making. American Journal of Primatology: Special Topics Issue, 68: 855-867.

Hopper, LM, Lambeth, SP, Schapiro, SJ, and Whiten, A. 2006. How do chimpanzees learn ‘Pan-pipes’ traditions?. International Journal of Primatology, 27(S1).

Hopkins, WD, Russell, J, Freeman, H, Reynolds, E, Griffis, C, and Leavens, DL. 2006. Lateralized scratching in chimpanzees (Pan troglodytes).Evidence of a Functional Asymmetry During Arousal. Emotion. 6, 553-559.

Hostetter, AB, Russell, J, Freeman, H, and Hopkins, WD. 2006. Now you see me, now you don’t: evidence that chimpanzees understand the role of eyes in attention. Animal Cognition, 10, 55-62.

Ross, S.R., Bettinger, T.M., and Bloomsmith, M.A. 2006. Patterns of wounding incidents in captive chimpanzee groups with adolescent males. International Journal of Primatology (supplement 1): 2.

Melber, T.N., Lonsdorf, E.V., and Ross, S.R. 2006. The Lester E. Lester E. Fisher Center for the Study and Conservation of Apes: A new center for the advancement of research, conservation and education. American Journal of Primatology 68 (supplement 1):121.

Lonsdorf, E.V. 2006. The role of the mother in the acquisition of tool-use skills in wild chimpanzees. Animal Cognition, 9: 36-46.

Lonsdorf, E.V., Travis, D., Pusey, A.E. and Goodall, J. 2006. Using retrospective health data from the Gombe chimpanzee study to inform future monitoring efforts. American Journal of Primatology: Special Topics Issue on Disease Risk Analysis, 68: 897-908.

Hopkins, WD, Cantalupo, C, Freeman, H, Russell, J, Kachin, M, and Nelson, E. 2005. Chimpanzees Are Right Handed When Recording Bouts Rather Than Frequencies in Hand Use. Laterality. 10, 121-130.

Bloomsmith, M.A., Baker, K.C., Ross, S.R. and Lambeth, S.P. 2005. Early rearing conditions and captive chimpanzee behavior: Some surprising findings. Nursery Rearing of Nonhuman Primates in the 21st Century. Kluver Academic Publishers, New York, New York, 289-312.

Hopkins, WD, Russell, J, Cantalupo, C, Freeman, H, and Shapiro, SJ. 2005. Factors influencing throwing in chimpanzees (Pan troglodytes). Journal of Comparative Psychology. 119, 363-370.

Lonsdorf, E.V. 2005. Sex differences in the development of termite-fishing skills in wild chimpanzees (Pan troglodytes schweinfurthii) of Gombe National Park, Tanzania. Animal Behaviour, 70: 673-683.

Hopkins, WD, Russell, J, Freeman, H, Buehler, N, Reynolds, E, and Shapiro, SJ. 2005. The distribution and development of handedness for manual gestures in captive chimpanzees (Pan troglodytes). Psychological Science, 16, 487-493.

Lonsdorf, E.V. and Hopkins, W.D. 2005. Wild chimpanzees show population-level handedness for tool use. Proceedings of the National Academy of Sciences, 102: 12634-12638. http://www.pnas.org/cgi/content/abstract/0505806102.

Ross, SR and Lukas, KE. 2005. Zoo Visitor Behavior at an African Ape Exhibit. Visitor Studies Today, 8(1): 4-12.

Lukas, K.E. and Ross, S.R. 2005. Zoo visitor knowledge and attitudes towards gorillas and chimpanzees.. Journal of Environmental Education, 36(4): 33-48.

Freeman, H, Cantalupo, C, Weiss, A, King, J, Hopkins, W. 2004. Association between personality and brain asymmetries in the limbic system of chimpanzees. American Journal of Primatology, 62 (S1): 105.

Freeman, H, Cantalupo, C, Hopkins, WD. 2004. Asymmetries in the Hippocampus and Amygdala of Chimpanzees (Pan troglodytes). Behavioral Neuroscience. 118: 1460-1465.

Russell, J, Freeman, H, Schapiro, S, Hopkins, W. 2004. Chimpanzee handedness: throwing out the first pitch. American Journal of Primatology, 62 (S1): 106.

Maestripieri, D. and Ross, S.R. 2004. Maternal influences on infant behavioral development in western lowland gorillas. Advances in Psychology Research, 27: 96-112.

Lonsdorf, E.V., Pusey, A.E. and Eberly, L. 2004. Sex differences in learning in chimpanzees. Nature, 428: 715-716.

Maestripieri, D. and Ross, S.R. 2004. Sex differences in play among western lowland gorilla (Gorilla gorilla gorilla) infants: Implications for adult behavior and social structure. American Journal of Physical Anthropology, 123 (1): 52-61.

Atsalis, S., Margulis, S.W., Bellem, A. and Wielebnowski, N. 2004. Sexual behavior and hormonal estrus cycles in captive aged lowland gorillas (Gorilla gorilla). American Journal of Primatology, 62: 123-132.

Ross, S.R. 2003. A guide to caring for chimpanzees (book review). Zoo Biology, 22: 609-612.

Hopkins, W.D., Stoinski, T.S., Lukas, K.E., Ross, S.R. and Wesley, M.J. 2003. Comparative Assessment of handedness for a coordinated bimanual task in chimpanzees (Pan), gorillas (Gorilla), and orangutans (Pongo). Journal of Comparative Psychology, 117(3): 302-308.

Ross, S.R. 2003. North American regional studbook for the chimpanzee (Pan troglodytes). Lincoln Park Zoo, Chicago, Illinois.

Bloomsmith, M., Kuhar, C., Baker, K., Lambeth, S., Brent, L., Ross, S. and Fritz, J. 2003. Primiparous chimpanzee mothers and their infants: Behavior, interactions, and success. Applied Animal Behavior Science, 84: 235-250.

Margulis, S.W., Whitham, J.C. and Ogorzalek, K. 2003. Silverback male presence and group stability in gorillas (Gorilla gorilla). Folia Primatologica, 74: 92-96.

Goodall, J. and Lonsdorf, E.V. 2002. Cultures in Chimpanzees. Oxford University Press Encyclopedia of Evolution.

Maestripieri, D., Ross, S.K. and Megna, N.L. 2002. Mother-infant interactions in western lowland gorillas (Gorilla gorilla gorilla): Spatial relationships, communication, and opportunities for social learning. Journal of Comparative Psychology, 116(3): 219-227.

Bloomsmith, M., Kuhar, C., Baker, K., Lambeth, S., Brent, L., Ross, S. and Fritz, J. 2001. Early interactions between primiparous chimpanzees and their infants. American Journal of Primatology, 54(1): 31.

Ross, S.K. and Lukas, K.E.  2001. Exhibit use by great apes as part of a post-occupancy evaluation. American Journal of Primatology, 54(1): 31.

Ross, S.K., Barger, N., Ganas, J., Lukas, K., Nichols, C., Megna, N., Stoinski, T. and Maestripieri, D. 2001. Maternal scaffolding of offspring behavior in western lowland gorillas. American Journal of Primatology, 54(1): 31.

Baker, K.C., Bloomsmith, M.A., Ross, S.K., Lambeth, S.P. and Noble, P.L. 2001. The behavioral effects of control vs. passive exposure to joystick-controlled computer tasks intended as enrichment for chimpanzees. American Journal of Primatology, 54(1): 64.

Bloomsmith, M.A., Ross, S.K. and Baker, K.C. 2000. Control over computer-assisted enrichment for socially housed chimpanzees. American Journal of Primatology, 51(1): 45.

Bloomsmith, M.A., Baker, K.C., Ross, S.K. and Lambeth, S.P. 1998. Enlarging chimpanzee social groups: The behavioral course of introductions. American Journal of Primatology, 45: 171.

Baker, KC and Ross, SK. 1998. Outdoor access: The behavioral benefits to chimpanzees. American Journal of Primatology, 45: 166.

Gillespie, T.R., Lonsdorf, E.V., Canfield, E.P., Meyer, D.J., Nadler, Y., Raphael, J., Pusey, A.E., Pond, J., Pauley, J., Mlengeya, T., Travis, D.A. . Demographic and Ecological Affects on Patterns of Parasitism in Eastern Chimpanzees (Pan troglodytes schweinfurthii) in Gombe National Park, Tanzania. American Journal of Physical Anthropology, 143: 534-544.