In the chilly, nutrient-rich currents swirling around the western islands of the Galapagos Archipelago, a bizarre underwater ritual unfolds under the cover of darkness. While most shark species must swim continuously to force oxygen-carrying water over their gills, a small, heavily armored predator rests quietly on the jagged basaltic seafloor. As night falls, it does not launch into a sleek, open-water sprint. Instead, it places its muscular pectoral and pelvic fins on the volcanic rock and begins to crawl, step by deliberate step, navigating the treacherous topography like a biological all-terrain vehicle. This is the Galapagos bullhead shark ( Heterodontus quoyi ), a highly localized and cryptic species that represents one of the most evolutionarily distinct lineages in the eastern Pacific Ocean. Belonging to the ancient order Heterodontiformes, commonly known as hornsharks or bullhead sharks, this species is a living testament to a successful, highly specialize...