The intertidal habitat is a thunderdome that pushes its inhabitants to their physiological limits. Within this rapidly changing microcosm, organisms must navigate intense biotic (e.g. predation threat) and abiotic (e.g. hypoxia, desiccation) stressors to forage and reproduce. Among the most successful dwellers of this naturally exigent environment are members of the Sculpin superfamily, Cottoidea. Sculpins are a widely diverse group; some species spend their entire life cycles perpetually navigating intertidal areas, while other species spend the juvenile stages of their lives in these habitats and migrate to subtidal habitats as they mature. Thus, species are adapted to either consistent overexertion or temporary strain, respectively. These marked differences in the natural history of such closely related species have the potential to exert differential selective pressures across the body of these organisms and result in different developmental trajectories. In this study we use three-dimensional geometric morphometrics to compare the allometric scaling of urohyal shape in two species of sculpin (Oligocottus maculosus and Myoxocephalus polyacanthocephalus). The urohyal, an ossified structure known to play a role in fish respiration, is an ideal measuring tool for the pressure exerted on the respiratory system of sculpins in any environment. We predict that M. polyacanthocephalus will exhibit larger slopes than O. maculosus due to the former’s adult migration into subtidal habitats and subsequent distancing from the constraints that come with colonizing intertidal environments.