Details of the heads of adult females of Incilius tacanensis (left: MVZ 159445) and I. bocourti (right: UTA A-13008), showing diagnostic differences in the cranial crests, parotoid glands, and general shape. Incilius bocourti is a much larger species than is I. tacanensis (see Fig. 1), so these images are not at the same scale in order to facilitate direct comparisons.