- 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
- Simpson, R.K., Johnson, M.A., Murphy, T.G. 2015. Migration and the evolution of sexual dichromatism: evolutionary loss of female coloration with migration among wood-warblers. Proceedings of the Royal Society B. 282: 2015375. PDF
Media Coverage: Science, Nature, IFL Science, Phys.org, Nature World News, Richard Dawkins Foundation
- 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
- Credited in: Coneflower Studios. 2016. Super Hummingbirds. PBS Nature. http://www.pbs.org/wnet/nature/super-hummingbirds-about/14472/
- Simpson, R.K. 2014. Ask A Biologist Top Question: Why do leaves change color. ASU’s Ask A Biologist. http://askabiologist.asu.edu/questions/why-do-leaves-change-color
- Simpson, R.K. 2014. Biology Bits: Feathers. ASU’s Ask A Biologist. http://askabiologist.asu.edu/biology-bits/feather-bits
- Featured in: Sturm, M. 2014. Faint of Heart Need Not Apply. ASU’s SOLS Magazine. 10, 1: 19-23.