Not just any limpet, but one that has found a safe little berth on Runswick beach:
This limpet (Patella sp.) has found a depression in a rock, has over many tides hunkered himself down and made a home. This individual has chosen a risky place to live: it is high on the beach and spends a lot of time exposed to the beaks of limpets' predators (seagulls etc.) as the tide falls. But no gull has managed to lever this shell off the rock.