Janine Chalk-Wilayto, PhD

Wilayto, JanineEducation

  • BA, Anthropology, Boston University
  • PhD, Hominid Paleobiology, George Washington University
  • Postdoctoral Fellow, Functional Anatomy & Evolution, Johns Hopkins School of Medicine

Research Interest

Dr. Chalk-Wilayto’s research interests center on the relationships among food processing behavior, food properties, and functional anatomy of the feeding system in primates. She has a particular interest in examining these relationships through development. Dr. Chalk-Wilayto’s research program integrates ecological and morphological methods to quantify ontogenetic changes in dietary demands and feeding behavior and relate those changes to dietary adaptations in the masticatory system.

Selected Publications

  • Chalk-Wilayto, J., Ossi-Lupo, K., Raguet-Schofield, M. (2016). Growing up tough: Comparing the effects of food toughness on juvenile feeding in Sapajus libidinosus and Trachypithecus phayrei crepusculus.  J. Hum. Evol. 98, 76-89.
  • Coiner-Collier, S., Scott, R. S., Chalk-Wilayto, J., Cheyne, S. M., Constantino, P., Dominy, N. J., Elgart, A. A., Glowacka, H., Loyola, L. C., Ossi-Lupo, K., others (2016). Primate dietary ecology in the context of food mechanical properties.  J. Hum. Evol., 98, 103-118.
  • Chalk J., Wright B.W., Lucas P.W., Schuhmacher K.D., Vogel E.R., Fragaszy D.F., Visalberghi E., Izar P., and Richmond B.G. (2016). Age-related variation in the mechanical properties of foods processed by Sapajus libidinosus. American Journal of Physical Anthropology 159:199-209. 
  • Lucas P.W., Copes L., Constantino P.J., Vogel E.R., Chalk J., Talebi M., Landis M., and Wagner, M. (2012) Measuring toughness of primate foods and its ecological value. International Journal of Primatology 33 (3): 598-610.
  • Chalk J., Richmond B.G., Ross C.F., Strait D.S., Wright B.W., Spencer M.A., Wang Q., and Dechow P.C. (2011) A finite element analysis of masticatory stress hypotheses. American Journal of Physical Anthropology 145 (1): 1-10.
    Lucas P.W., Constantino P.J., Chalk J., Ziscovici C., Wright B.W., Fragaszy D., Izar P., Ottoni E., Visalberghi E., Hill D.A., Lee J.J.-W., Chai H., Darvell B.W., Lee P.K.D., and Yuen T.D.B. (2009) Indentation as a technique to assess the mechanical properties of fallback foods. American Journal of Physical Anthropology 140 (4): 643-52.
  • Strait D.S., Weber G.W., Neubauer S., Chalk J., Richmond B.G., Lucas P.W., Spencer M.A., Schrein C., Dechow P.C., Ross C.F., Grosse I.R., Wright B.W., Constantino P., Wood B.A., Lawn B., Hylander W.L., Wang Q., Byron C.D., Slice D.E., and Smith A.L. (2009) The feeding biomechanics and dietary ecology of Australopithecus africanus. Proceedings of the National Academy of Sciences USA 106: 2124-2129.
  • Wright B.W., Wright K.A., Chalk J., Verderane M., Fragaszy D., Visalberghi E., Izar P., Ottoni E., Constantino P., and Vinyard C.J. (2009) Fallback foraging as a way of life: using dietary toughness to compare the fallback signal among capuchins and implications for interpreting morphological variation. American Journal of Physical Anthropology 140 (4): 687-99.


  • National Science Foundation Grant, BCS Division – Biological Anthropology
  • Navicent Foundation Research and Education Grant
  • American Association of Anatomists Education Outreach Grant

Professional Involvement

  • American Association of Anatomists
  • American Association of Physical Anthropologists
  • International Primatological Society

Contact Dr. Janine Chalk-Wilayto