Sue Daly / Goose barnacles (Lepas anatifera) on shore, at low tide, Channel Islands, UK January

Norbert Wu / Leaf Barnacle (Pollicipes polymerus), a colorful variation of the goose-neck barnacle found only in Nakwakto Rapids and a few other places, Vancouver Island, British Columbia, Canada

Norbert Wu / Leaf Barnacle (Pollicipes polymerus), a colorful variation of the goose-neck barnacle found only in Nakwakto Rapids and a few other places, Vancouver Island, British Columbia, Canada

GEORGETTE DOUWMA / Leaf barnacles {Pollicipes polymerus} attached to wave-swept boulders, between high and low tide lines, Washington, USA.

GEORGETTE DOUWMA / Close-up of Leaf barnacles {Pollicipes polymerus} Washington, USA.

GEORGETTE DOUWMA / Leaf barnacle {Pollicipes polymerus} attached to wave swept boulder, between high and low tide lines, Washington, USA

David Shale / Feeding Goose barnacles (Lepas anatifera) found attached to drifting oceanic buoy, Atlantic

Mark Taylor / Goose Barnacles (Pollicipes polymerus) feeding, Pacific, USA. Cirri extended to catch prey.

Rob Tilley / Goose barnacles {Pollicipes polymerus} + Mussels, Pacific rim NP, BC, Canada

Fred Bavendam / Leaf Barnacle (Pollicipes polymerus) group, Nakwakto Rapids, British Columbia, Canada

Fred Bavendam / Leaf Barnacle (Pollicipes polymerus) growing on a rocky current swept ledge, Turret Rock, Nakwakto Rapids, British Columbia, Canada

David Hall / Goose barnacles feeding {Pollicipes sp} British Columbia Canada