10. Simpson, R.K., McGraw, K.J. 2019. The evolution of complex courtship signals and their interactions in hummingbird visual traits. In review at The American Naturalist.
9. Simpson, R.K., McGraw, K.J. 2019. Experimental signal mis-matches uncover specificity of evolutionary links between multiple signals and their interactions in hummingbirds. Evolution, Early Access. PDF
8. Simpson, R.K. & McGraw, K.J. 2018. It’s not just what you have, but how you use it: solar-positional and behavioural effects on hummingbird colour appearance during courtship. Ecology Letters, 21: 1413-1422. PDF
Media Coverage: Science (Video), Forbes
7. Simpson, R.K. & McGraw, K.J. 2018. Multiple signaling in a variable environment: expression of song and color traits as a function of ambient sound and light. Biotropica 50: 531-540. PDF
6. Simpson, R.K. & McGraw, K.J. 2018. Two ways to display: male broad-tailed hummingbirds exhibit different dynamic color tactics based on sun orientation. Behavioral Ecology 29: 637-648. Link
Media Coverage: Oxford University Press Tumblr
5. Simpson, R.K. 2017. Courtship and territorial behaviors of three hummingbird species in Arizona. Arizona Birds 2017: 1-7. PDF
4. Ligon, R.A., Simpson, R.K., Hill, G.E., McGraw, K.J. 2016. Evolutionary innovation and the diversification of carotenoid-based pigmentation in finches. Evolution 70: 2839-2852. PDF
3. 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
2. 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
1. 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
Simpson, R.K. 2018. How do male hummingbird dance moves alter their appearance? Oxford University Press blog guest post (link).
Simpson, R.K. 2014. Ask A Biologist Top Question: Why do leaves change color. ASU’s Ask A Biologist (link).
Simpson, R.K. 2014. Biology Bits: Feathers. ASU’s Ask A Biologist (link).
Created in: 2017. Why some things are shiny? INSIDER Science (link).
Credited in: Coneflower Studios. 2016. Super Hummingbirds. PBS Nature (link).
Featured in: Sturm, M. 2014. Faint of Heart Need Not Apply. ASU’s SOLS Magazine. 10, 1: 19-23.