Definition
A barnacle is a type of marine crustacean that attaches itself to hard surfaces, such as rocks, boats, and even whales. They are encased in a hard, shell-like structure. Think of them as the tiny hitchhikers of the sea. Barnacles are filter feeders, using feathery appendages to capture food from the water. They can be a nuisance to boat owners, but they are a natural part of the marine ecosystem. Their adhesive abilities are remarkable.