Portfolio of crab photographs. Crabs are crustaceans, living in all oceans, on land, and in freshwater. They are short-tailed, but mostly their tail is hidden. The crabs mostly live in the sea. Land crabs sometimes visit the sea to pass their early stages in it. Crabs are breathing through gills, but in the land crab, the cavities are large and act as a lung. Crabs have 10 feet, and we also call them Decapod. Usually, crabs step sideways, but also able to walk forward and backward. Check it out next time on the beach. They communicate with each other with drumming and waving with the pincers. You can license and purchase a photographic print in our portfolio.