Barnacles crowd for space on seashore rocks. They define the upper limits of high tide because they must be covered by water twice a day to survive. Rockweed is floated by pairs of air bladders. Irish moss is also present. Common eider, an oceanic duck, lives near the shore on barnacles, crabs, and sea urchins.
Herring gulls are constant companions here.
They often follow fishing boats for scraps, rising a real racket. Rock crabs are often caught in lobster traps. They are common food of gulls. Green sea urchins have spines for protection. They are found in deep tidepools and deep water.