Diet- When submerged in water, the barnacle opens its "trapdoor" to extend its feathery
feet, called cirri, into the water, trapping plankton to eat. The legs also have gills for breathing.
Anatomy- The Rock Barnacle is about 1 inch high, and 1/2 inch wide
at its base. It has a flat, white top. They also have 6 pairs of feathery legs which extend
through the opening when feeding. It has a few vertical grooves at the base.
Interesting Fact- Rock barnacles look like a tiny shrimp glued down by the top
of its head, with its antennae waving in the current.