Acorn barnacles (Coronula diaderma) and goose neck barnacles (Pollicipes pollicipes) attached to the pectoral fin of a Humpback whale (Megaptera novaeangliae) Hawaii. An adult whale can carry as much as 1,000 lbs of barnacles, Hawaii. The circular mark in the center of this fin marks the location where a barnacle once lived; Hawaii, United States of AmericaImage #: 33532150 See More From: Dave Fleetham