Seashells, seashore creatures, fishes, reptiles and amphibians, birds, mammals, and plants live in estuaries. Sandy Beaches Sandy beaches are found south of the Cape Cod area. The beaches are made of fine grains of sand formed from crushed shells and rocks. The waves and wind cause the beaches to change continuously. Most organisms avoid exposure to the waves and wind by burying themselves under the sand.
Sand dunes develop as a result of swirling winds around beach plants.
The plants help stabilize the sand dunes. Seashells, seashore creatures, insects and spiders, fishes, birds, and plants can be found along sandy beaches. Salt Marshes Salt marshes are areas of transition between the land and the sea. The marshes are usually found near estuaries making them excellent areas for fish nurseries, as well as nesting and resting places for birds and other animals. The low-level areas are exposed to tides daily.