Most animal species have populations with equal ratios of males and females, but some have naturally biased sex ratios. There are are many factors that cause the bias to occur-- so what happens to the under-represented sex of a species over evolutionary time? I will investigate by studying the morphology and genetics of a female-biased daddy-longlegs species (Leiobunum relictum) that seems to only occur in the geologically-unique Wichita Mountains of Oklahoma.