Rock pools are miniature enviroments. For a few hours each day they are cut off from the sea, providing a safe haven for creatures while the tide is out.
Every rock, crevice and clump of seaweed is an important home to anemones, crabs, shrimps and small fish.
Follow the link to the Marine Conservation Society's Rockpool Explorers' guide. On page two you will find the Rockpool Life Spotter sheet with examples of the creatures you might find.