Sexually dimorphic traits are used for mate selection either by female choice (intersexual selection) or male–male competition (intrasexual selection). In anurans, both types of selection mechanisms, especially intersexual selection, generally will favor large males. In bufonids, however, male size does not seem to be a factor in mate selection. Very little is known about the mating preferences of the endangered Houston Toad (Bufo houstonensis). Studies examining the breeding dynamics of B. houstonensis were conducted during the early 1980s, with conflicting results. To further examine mate selection, 329 Houston Toads were collected from Bastrop State Park, Texas, and the snout–urostyle length (SUL) was measured. There was no significant difference in size for males found in amplexus, suggesting females may not select larger males.