Data from DOI 10.1002/jmor.20346, ERA Cramer, T Laskemoen, E Stensrud, M Rowe, F Haas, JT Lifjeld, GP Sætre, and A Johnsen. 2015. Morphology-function relationships and repeatability in the sperm of Passer sparrows. J Morphol 276:370-377. Included in this data set are three .csv files containing data, one .xlsx file with information on the naming of columns in the data files (information for each data file is in a separate tab in the .xlsx file), and R code. However, this R script should be sufficient to understand exactly how analyses were performed. Justification for analysis decisions is indicated in the manuscript. Note also that sperm morphology samples and videos are accessioned to the University of Oslo Natural History Museum.