We use experimental approaches to integrate endocrinology, evolutionary biology and neurobiology in a bid to better understand the basis of natural behavior in vertebrates. We are especially interested in the biological basis of intra-population variation (within- and among-individuals) with a focus on sexual communication (bioacoustics and mate choice) and (neuro)endocrine traits as the phenotypic characters of interest. Amphibians serve as the principal study organisms. Listen to a recent podcast about our frog sex research.