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14. Simpson, RK, Mistakidis, AF, Doucet, SM. Natural and sexual selection have different effects on plumage color and conspicuousness in wood-warblers. In Review at The American Naturalist.

13. Sepp, T, Webb, E, Simpson, RK, Giraudeau, M, McGraw, KJ, Hutton, P. Light at night reduces digestion efficiency of developing birds: an experiment with king quail. In Review at Journal of Experimental Biology.

12. Reed, S*, Simpson, RK, McGraw, KJ. Feather morphological predictors of angle-dependent color changes in parrot plumage. In Review at Journal of the Royal Society Interface.
      *Undergraduate author

11. Simpson, RK. McGraw, KJ 2019. Interspecific covariation in courtship displays, iridescent plumage, solar orientation, and their interactions in hummingbirds. The American Naturalist, Early View.

10. Saini, C*, Hutton, P, Gao, S, Simpson, RK, Giraudeau, M, Sepp, T, Webb, E, McGraw, KJ. 2019. Exposure to artificial light at night increases innate immunity during development in a precocial bird. J. of Comparative Biochemistry and Physiology A, 233: 84-88. PDF
      *Undergraduate author

9. Simpson, RK, McGraw, KJ. 2019. Experimental signal mis-matches uncover specificity of evolutionary links between multiple signals and their interactions in hummingbirds. Evolution, 73: 436-451. PDF
      Media Coverage: Evolution Digest

8. Simpson, RK, McGraw, KJ. 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, RK, McGraw, KJ. 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, RK, McGraw, KJ. 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, RK. 2017. Courtship and territorial behaviors of three hummingbird species in Arizona. Arizona Birds 2017: 1-7. PDF

4. Ligon, RA, Simpson, RK, Mason, NA, Hill, G.E., McGraw, KJ. 2016. Evolutionary innovation and the diversification of carotenoid-based pigmentation in finches. Evolution 70: 2839-2852. PDF

3. Hutton, P,* Ligon, RA, McGraw, KJ, Seymoure, BM, Simpson, RK. 2015. Dynamic color communication. Current Opinions in Behavior 6: 41-49. PDF
      *All authors contributed equally

2. Simpson, RK, Johnson, MA, Murphy, TG. 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,, Nature World News, Richard Dawkins Foundation

1. Murphy, TG, West, JA, Pham, TT, Cevallos, LM, Simpson, RK, Tarvin, KA. 2014. Same trait, different signals: Unlike females, male goldfinches do not signal status with bill color. Animal Behaviour 93: 121-127. PDF

Popular Articles

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).

Popular Media

Created in: 2017. How Animals Can Change Colors. Science Insider (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.

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