Barnacles are small marine animals that attach themselves to hard surfaces, such as rocks, ships, and even the shells of sea turtles. They have a hard outer shell that protects them from predators and harsh ocean conditions. Barnacles are filter feeders, using their feathery appendages to catch tiny food particles from the water. These creatures are fascinating because they can live in a variety of environments, from tidal pools to deep ocean waters. Once they attach to a surface, they stay there for life, which can be several years. Barnacles play an important role in the marine ecosystem by providing food for animals like sea stars and crabs.