Acorn barnacle, Close-up of an acorn barnacle (Semibalanus balanoides, white centre) with its cirri (feathery appendages) exposed. This marine crustacean is common in the intertidal zones of north-western Europe and both coasts of North America, where it lives on rocks and other solid surfaces. It uses its cirri to filter food from the water.
Model release not required. Property release not required.