Figure 1. Violin plots of the log-transformed viscosity measurements obtained from fluids collected from two regions of the female reproductive tract within Peromyscus mice species with naturally varying mating systems. Blue dots represent particle tracking data obtained from three monogamous species (P.californicus , P. eremicus , and P. polionotus ), red dots represent particle tracking data obtained from three polyandrous species (P. maniculatus , P. leucopus , and P. gossypinus ). Asterisks denote differences within each reproductive region between the mating systems (*** P< 0.001).