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Rock pools are common on some shores. These areas are often home to many species of crabs, shellfish, shallow water fish and many other animals. Many environmental things affect these areas, for example, waves, sunlight, salinity, wind, and water tide. About 300,000 species have been found in the intertidal zone. These species have to tolerate the pounding of waves, the changes in temperature, and the drying out at low tide.