The University of Kentucky's Ecological Research Facility (ERF) is a roughly 55-acre tract of old farmland on the north side of Lexington Kentucky. Consisting of old fields and artificial ponds, ERF is located in a residential neighborhood between downtown Lexington and the surrounding horse farms. ERF is host to a diverse assortment of native, introduced and invasive species, and provides a field site for several UK and extramural research scientists. Beginning summer 2012, ERF will host a site based National Science Foundation Research Experiences for Undergraduates program on Suburban Ecology and Invasive Species.