Research in behavioral neuroscience seeks to explain behavioral variation. Our behavioral genomics approaches focus on those aspects of individual differences that can be traced through their neurobiological underpinnings to genetic sources. The behaviors of an organism include complex systems, and this complexity characterizes all levels of analysis. Faculty working in behavioral genomics laboratories employ behavioral phenotyping, classical behavioral genetics, systems neuroscience, molecular biological, biostatistical, and "omics" approaches. Studies range from groups of genetically related behaviors to networks of genes coordinately-expressed in specific brain regions. Species include human, non-human primates, rats, voles, and mice.