Characteristics of the study population of 421 Mojave Desert tortoises (Gopherus agassizii) from the cross-sectional study. Animals included in the longitudinal study (Table 2) were drawn from this set. The data were collected at health assessments conducted between 2011 and 2016 at four study sites: Large-Scale Translocation Site (LSTS; Nevada, USA), Ivanpah Solar Electric Generating System (ISEGS; California, USA), Desert Stateline Solar Facility (California, USA), and Silver State South Solar Energy Center (Nevada, USA).