Gecarcinidae is a family of crabs commonly known as land crabs. They are primarily found in tropical and subtropical regions, often inhabiting coastal areas and forests. These crabs are unique because they spend most of their lives on land, returning to the sea only to breed. Land crabs have adapted to terrestrial life with specialized gills that allow them to breathe air. They play a vital role in their ecosystems by helping to decompose organic matter and serving as a food source for various predators. Their behavior and life cycle are closely tied to the lunar cycle, influencing their migration patterns.