Christine M. Drea
Earl D. McLean Professor
I have two broad research interests, sexual differentiation and social behavior, both focused on hyenas and primates. I am particularly interested in unusual species in which the females display a suite of masculinized characteristics, including male- like or exaggerated external genitalia and social dominance. The study of naturally occurring hormones in such unique mammals can reveal general processes of hormonal activity, expressed in genital morphology, reproductive development, and social behavior. Taking a combined laboratory and field approach allows me to relate captive data to various facets of the animals' natural habitat, thereby enhancing the ecological validity of assay procedures and enriching interpretation in an evolutionary framework. The goal of comparative studies of hyenas and lemurs is to help elucidate the mechanisms of mammalian sexual differentiation.
My research program in social behavior focuses on social learning and group cohesion. Using naturalistic tasks that I present to captive animals in socially relevant contexts, I can investigate how social interaction modulates behavior, problem- solving, and cognitive performance. By studying and comparing models of carnivore and primate foraging, I can better understand how group-living animals modify their actions to meet environmental demands. A primary interest is determining whether similar factors, related to having a complex social organization, influence learning and performance across taxonomic groups. I am also interested in how animals learn rules of social conduct and maintain social cohesion, as evidenced by their patterns of behavioral developmental, the intricate balance between aggression and play, the expression of scent marking, and the social facilitation or inhibition of behavior.
Cunha, Gerald R., et al. “Development of the external genitalia: perspectives from the spotted hyena (Crocuta crocuta).” Differentiation; Research in Biological Diversity, vol. 87, no. 1–2, Jan. 2014, pp. 4–22. Epmc, doi:10.1016/j.diff.2013.12.003. Full Text
Delbarco-Trillo, Javier, et al. “Chemical differences between voided and bladder urine in the aye-aye (Daubentonia madagascariensis): implications for olfactory communication studies.” American Journal of Primatology, vol. 75, no. 7, July 2013, pp. 695–702. Epmc, doi:10.1002/ajp.22083. Full Text
Drea, Christine M., et al. “The "secret" in secretions: methodological considerations in deciphering primate olfactory communication.” American Journal of Primatology, vol. 75, no. 7, July 2013, pp. 621–42. Epmc, doi:10.1002/ajp.22143. Full Text
Charpentier, Marie J. E., et al. “Nasopalatine ducts and flehmen behavior in the mandrill: reevaluating olfactory communication in Old World primates.” American Journal of Primatology, vol. 75, no. 7, July 2013, pp. 703–14. Epmc, doi:10.1002/ajp.22146. Full Text
Charpentier, Marie J. E., and Christine M. Drea. “Victims of infanticide and conspecific bite wounding in a female-dominant primate: a long-term study.” Plos One, vol. 8, no. 12, Jan. 2013, p. e82830. Epmc, doi:10.1371/journal.pone.0082830. Full Text Open Access Copy
delBarco-Trillo, Javier, et al. “Eulemur, me lemur: the evolution of scent-signal complexity in a primate clade.” Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, vol. 367, no. 1597, July 2012, pp. 1909–22. Epmc, doi:10.1098/rstb.2011.0225. Full Text
Hammond, Geoffrey L., et al. “Phylogenetic comparisons implicate sex hormone-binding globulin in "masculinization" of the female spotted hyena (Crocuta crocuta).” Endocrinology, vol. 153, no. 3, Mar. 2012, pp. 1435–43. Epmc, doi:10.1210/en.2011-1837. Full Text
MacLean, Evan L., et al. “How does cognition evolve? Phylogenetic comparative psychology.” Anim Cogn, vol. 15, no. 2, Mar. 2012, pp. 223–38. Pubmed, doi:10.1007/s10071-011-0448-8. Full Text Open Access Copy
Rushmore, Julie, et al. “Sight or scent: lemur sensory reliance in detecting food quality varies with feeding ecology.” Plos One, vol. 7, no. 8, Jan. 2012, p. e41558. Epmc, doi:10.1371/journal.pone.0041558. Full Text
Charpentier, M. J. E., et al. “Nasopalatine ducts and flehmen behavior in the mandrill (Mandrillus sphinx): Reevaluating olfactory communication in primates.” American Journal of Primatology, 2012.