Evolutionary radiation of earless frogs—The loss of hearing structures has occurred multiple times in the amphibian tree of life, in diverse habitats and under different selection pressures. In most cases, male earless frogs have retained the ability to call, and species have evolved alternative sensory pathways that enable the transmission of sound to the inner ear. Several genera of terrestrial breeding frogs (Strabomantidae) contain both eared and earless species, and in some clades the large majority of species are earless. In a recent study focusing on terrestrial breeding frogs in the genus Phrynopus, my collaborators and I identified a single evolutionary transition involving the loss of hearing structures that appears to have predated the increase of species diversity in this group. We also observed the absence of advertisement calls, which is highly unusual within frogs, and found that species’ body size and body shape change with elevation (von May et al. 2018,  PeerJ). This research is important because it will help explain what drives phenotypic convergence and trait loss at high elevations. A new research project focusing on this topic is currently being conducted in collaboration with Molly Womack, Allison Alvarado, and other colleagues.