These data are property of Duke Energy and were collected by Western EcoSystems Technology. SE = Searcher efficiency Season = season of data collection Found = whether (1) or not (0) a carcass was found seID = ID CP = Carcass persistence Season = season of data collection LastPresent = days after placement of carcass after which the carcass was last seen Days Persisted = number of days the carcass persisted, NA = carcass was present until end of trial SS = Search schedule R code to generate the search schedule Fatalities Year = year of data collection treatment = carcasses found at the treatment site control = carcasses found at the control site To estimate detection rates per site per time period (before and after), we used the R (R Core Team 2019) package GenEst (Dalthorp et al. 2020) and generally followed procedures outlined in the user guide (Simonis et al. 2018) and vignettes (Dalthorp et al. 2018). Therefore, see the references below for information regarding the formatting of the GenEst input files. Dalthorp, D. H., J. Simonis, L. Madsen, M. M. Huso, P. Rabie, J. M. Mintz, R. Wolpert, J. Studyvin, and F. Korner-Nievergelt. 2018. Generalized Mortality Estimator (GenEst) - R code & GUI: U.S. Geological Survey Software Release. Dalthorp, D., J. Simonis, L. Madsen, M. Huso, P. Rabie, J. Mintz, R. Wolpert, J. Studyvin, and F. Korner-Nievergelt. 2020. GenEst: Generalized Mortality Estimator. R package version 1.4.4. R Core Team. 2019. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria. Simonis, J., D. H. Dalthorp, M. M. Huso, J. M. Mintz, L. Madsen, P. Rabie, and J. Studyvin. 2018. GenEst User Guide—Software for a Generalized Estimator of Mortality: U.S. Geological Survey Techniques and Methods, v. 7, no. C19.