The Gooseneck Barnacle (Pollicipes polymerus) is made up of two distinct parts: (1) the chalky gray calcareous plates of varying sizes which enclose most of the viscera and appendages and (2)
the tough leathery stalk or neck which is brown or red and contains the gonads and adhesive gland.

Gooseneck barnacles feed on amphipods and other creatures up to the size of a house fly. The size of the food eaten by the gooseneck barnacle is larger than that collected by acorn
barnacles. To feed, the gooseneck barnacle spreads its cirri to form a net and instead of facing the incoming waves they take advantage of the water running off the rocks or the down-rushing water. All organisms in a particular area will be oriented the same way. When sufficient food has accumulated on the cirri, they withdraw the catch and transfer the food to the mouth parts.
They are found on rocky cliffs exposed to the open Pacific coast. They are restricted to
rocks sheltered from direct sunlight and are fairly restricted to the upper 2/3 of the midintertidal zone.