My research focuses on understanding how the processes of natural and sexual selection shape physiological and morphological traits. Specifically, I am interested in how hormones link animals to their biotic and abiotic environments through the regulation of performance traits important to fitness. To accomplish this, I integrate theory and techniques from physiology, evolutionary ecology, animal behavior, and functional morphology, and I combine laboratory experiments with correlative studies of natural populations. I primarily work with reptiles as model systems, and I conduct research in the southwestern US and the Caribbean. Some of my current projects include: How steroid hormones mediate performance in lizards How endocrine systems regulate social behavior in Caribbean Anolis lizards Direct and indirect effects of sexually selected traits on animal performance Examining performance consequences of muscle fiber composition in lizards