We examined the effects of various human and environmental factors on mammal species densities. Some species are known to adapt and thrive in the face of expanding urbanization, but with this increased human activity also comes competition for resources. Identifying key factors which influence species density in urban areas can lead to policy recommendations for more sustainable urban growth. We explored a variety of models, and we ultimately obtained the best results using Random Forests regression. This model also gave us insight into which of the human and environmental features in our dataset have the greatest influence on species density.