Gooseneck barnacles also known as leaf barnacles filter feeding in an intertidal zone

gooseneck barnacles cluster intertidal ocean sea tide pool creatures animal species feathery feathers anatomy movement pacific ocean rocky shores stalked ecology ocean habitat environment wildlife behaviors feeding filtering scales pollicipes polymerus crustaceans filter tidal current underwater alive living science natural nature sea life ocean animals stalk cement gland mouth opening capturing legs cirri educational rocky seashore high tide submerged