[2] It is found attached to rocks in the lower part of the intertidal zone in areas with strong currents.

[3] When under water, Capitulum mitella extends its five hind pairs of thoracic legs and spreads them out in the current like a net.

Each barnacle is capable of fertilising other nearby individuals by transmitting sperm through a long, fine tube and also of brooding its own eggs in its mantle cavity.

[4] In Hong Kong harbour, where this barnacle can be found growing on pilings, it often has a nemertean worm (Nemertopsis quadripunctatus) living inside its mantle cavity and feeding on the eggs being brooded there.

[3] Capitulum mitella is one of about a dozen species of goose barnacle that are gathered commercially and eaten by humans.