Relating to certain species of aquatic animals and plants that live in areas of rock formations near lakes, oceans, etc.: At the water's edge, every stony ledge and every cranny or hole has it contingent of petricoline birds that are taking turns bringing home quantities of small fish to feed their ravenous chicks.

Each petricoline colony of seabirds produce noises that are raucous or piercing; such as, caw, kik-kik-kik, growl, or snarl and the gannets, the largest birds cut the air in their stupendous, straight-down dives.