There's a beach we like to go to that has a rocky outcrop pointing toward Trial Island. The deeper crevices in the rocks are full of goose neck barnacles.
They are attached to the rock by a leathery neck, so they can bend with the waves, as they gather plankton.
The waves carried them here, in the form of larvae that cemented themselves to the rock. And after they mate in the spring the waves will take their larvae away.