Distribution of the number of sperm transferred in a single ejaculate by virgin males to females (assayed by female fecundity). Box-plots indicate median and inter-quartile range (points beyond whiskers are candidate outlier values). Histogram shows all seven strains combined (no significant differences among strains), with vertical gray bar indicating the grand mean (166.93).
Murray et al. BMC Evolutionary Biology 2011 11:99 doi:10.1186/1471-2148-11-99