Understanding signal evolution, function, and diversity
Simpson, R.K. & McGraw, K.J. Multiple signaling in a variable environment: expression of song and color traits as a function of ambient sound and light conditions in a tropical songbird. In review at Journal of Avian Biology
Ligon, R.A., Simpson, R.K., Hill, G.E., McGraw, K.J. 2016 Comparative biochemical analyses of carotenoid pigmentation evolution in finches. Evolution (In Press).
Hutton, P.,* Ligon, R.A., McGraw, K.J., Seymoure, B.M., Simpson, R.K. 2015. Dynamic color communication. Current Opinions in Behavior. 6: 41-49. PDF
* All authors contributed equally
Murphy, G.M., West, J.A., Pham, T.T., Cevallos, L.M., Simpson, R.K., Tarvin, K.A. 2014. Same trait, different signals: Unlike females, male goldfinches do not signal status with bill color. Animal Behaviour. 93: 121-127. PDF