This project delves into the ecosystem of sandy beaches, particularly regarding the intertidal zone, otherwise known as the “swash zone”. Although the intertidal is a very unstable habitat, it is home to a variety of organisms that play key roles in the ecosystem. Mole crabs, for example, thrive in this habitat between land and sea. Because many animals, including fish and birds, eat mole crabs, they can serve as an important indicator of the species and can help determine the health of the environment. During this project our goal is to demonstrate whether or not it is true that the commonly larger female mole crabs are found lower in the wobble zone than the generally smaller male mole crabs, and why this may or may not be the case. This goal brings us to our scientific question. Is there a significant difference between the location and size of male and female mole crabs located in the swing zone? and why? Due to the constant shifting of sand which is in a constant state of change due to factors such as waves, tides, wind, seasons and storms, "sandy beaches are some of the most demanding habitats in the marine world" (Anderson Genevieve, 2003 Beaches sandy). However, despite the extreme conditions, a variety of organisms typical of sandy beaches are found in large numbers. Due to the harsh environment, the inhabitants have developed some interesting adaptations. Sandy beaches have a variety of organisms that populate the changing environment. “High tide waves tend to accumulate drifting seaweed along the crest of the berm” (Anderson Genevieve, 2003 Sandy Beach Life). Beached seaweed attracts the attention of many beach creatures. Algae flies often swarm around irresistible piles of decaying algae. Some other species that appreciate algae are very small red legs... in the center of the card... including various shorebirds such as Willets, Sanderlings and Gulls, blue crabs, ghost crabs and some fish" (Patricia B. Mitchell, 2008) The orange eggs on the bellies of female mole crabs make them especially delicious to fish. "The barred perch is a very common fish in the surf area, and sand crabs have been found to make up 90 percent of them. its diet" (Farallones, The Pacific Mole Crab). "Intertidal habitats along the West Coast of the United States are among the most diverse and productive regions in the world" (LiMPETS, "Why Monitor?"). and the known educational program as LiMPETS (Long-Term Monitoring and Experimental Training Program for Students) is a hands-on program for students, educators, and volunteer groups To adequately assess the health of California's intertidal systems, long-term monitoring is needed to carry this order forward of the day.