A broken range of boulders and miniature canyons begins soon after the columns of the fishermen's pier. The basal portions of the pillars are dotted with the spires of resting periwinkles, sea snails that have conquered the air but captured little new ground in a narrow belt of safety between the waves and the wind. Other grazers occupy the slopes of the rocky mounts; dove shells gather in messy gangs on damp terraces, while turbans and tops squeeze into cracks between and under the shelves. Nerites and slugs, having a higher tolerance for exposure, remain active in their assault on filaments that had survived their first foothold on a harsh terrain. Equal violence lurks in the coils of robust hunters – drills with bumps, knobs and spines – that menace barnacles and limpets with the force of tooth.