purple sea urchins in rocky intertidal zone

animal aquarium aquatic background bay beach beautiful big california child close closeup coastline color colorful concept creature decoration echinoderm ecology environment exploration explore fauna food hand holding intertidal kid learn life macro marine monterey nature ocean pacific pool purple purpuratus reef rocky sea seafood seashell sharp shell shellfish skeleton spines spiny strongylocentrotus sur texture their tide underwater urchin urchins usa water wildlife zone