The leaf barnacle occurs on rocky coasts in the intertidal zone, although it can also be found on deeper areas. It tends to occur in closely associated groups, forming clumps tightly attached to the rocks. This is their defence against stormy seas. Interestingly, the leaf barnacle develops faster where the sea is wilder. These crustaceans are resilient heroes, permanently exposed to the pounding of the waves at the foot of the cliffs. However, as they have little mobility, they are sometimes swept away by ocean currents.