beach coast dry dunes ecology habitat hummock hump natural nature sand sea Spain concept design dune grain graphic shore wall Anagallis blue environment flowers summer wild flora plants spanish abstract appearance backdrop background backgrounds clumps dark grass grasses growth late-afternoon light reeds reflective river river-sand riverside rushes sandy shadows shining shoreline sunlight sunshine textures tides vegetation water water-levels wavlets wetlands-plant auger shell auger snails corals gastropod India krayker mantle marine gastropod mollusks mollusc Mollusca Molluscs mollusks pebble pebbles sand-dwelling carnivores seashell seashells shell shells stone sun and sea Terebridae venomous barb alone footprints journey prints seaside stepping vacation walk walking colors colours footprint grainy impressions indented patterns shadow tracks animal colour dragon female Lacerta agilis lizard reptile Sand Lizard skin