Organisms there must be adapted to life in a place that is constantly changing. All of the organisms that make the intertidal zone home have adaptations that help them survive in this constantly changing environment. Crabs, mollusks, sea urchins and even bacteria often burrow under the sand when the tide is low. Soup's On Lots of the animals that burrow under the sand when the tide is out, come out to hunt for food when the tide returns. Crustaceans like the hermit crab scurry along the shore looking for food.
Sea worms stick their heads out of the sand and trap food as it comes by.
When the tide is out, the sea birds hit the beach looking for food. Curlews, sandpipers and red knots use their sharp bills to poke in the sand for worms and other invertebrates. American oyster catchers use their strong bills to crack open mussels and cockles. Gulls scour the beach searching for crabs and small fish. The intertidal zone isn't all the same.