The stalk is 2 cm long.
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.