As its name suggests, the Frilled Shark has frilled gills which allow it to breathe in a low-oxygen environment. This anatomical adaptation enables the shark to thrive in depths of up to 5,000 feet (1,524 meters). Though occasional sightings have been made at shallower depths, the Frilled Shark is most commonly found between 3,000 and 4,000 feet (between 914.4 meters and 1,219.2 meters).