Invasive species are non-native plants and animals that adversely affect native ecosystems. Due to a lack of natural predators and/or competitors, invasive species can reach high densities and disrupt ecosystems through direct (e.g. predation) and indirect (e.g. increased stress) effects on native species. In the McCleery lab we are primarily focused on assessing the effects of invasive species on small mammals in the southeastern United States, although we also complete research on other taxonomic groups. We have just completed two large projects on the impacts of red imported fire ants on native vertebrates and the impacts of invasive pythons in the Everglades.