Crab species are diverse and can be found in various habitats, including oceans, freshwater, and on land. They belong to the order Decapoda, which means they have ten limbs. Some well-known species include the blue crab, king crab, and hermit crab. Each species has unique adaptations that help them survive in their specific environments. Crabs are characterized by their hard exoskeleton, pincers, and a broad, flat body. They play important roles in their ecosystems, serving as both predators and prey. Many species are also economically significant, contributing to fisheries and local cuisines around the world.