Scanning electron micrograph of a filter feeding appendage (cirri) from a goose barnacle (Lepas). Goose barnacles are non-motile crustaceans that live in the sea attached to rocks and floating objects ...

But first they need to freshen up a bit. The barnacle unfurls eight pairs of delicate feathery legs called cirri, which they use to absorb oxygen from the water. The legs filter out plankton ...