Common Acorn Barnacle

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Latin nameSemibalanus balanoides
Size – Up to 1.5 cm diameter
Habitat – Mid and lower shore on rock

Barnacles start their life in the sea as plankton and then settle on a hard surface (usually rock but sometimes piers or boats) where they stay for the rest of their life. They grow plates around them to protect their body. To feed, they extend their feathery legs to catch plankton in the seawater.

Common Acorn Barnacle

Common Acorn Barnacle
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The Common Acorn Barnacle is the commonest barnacle on UK shores. Barnacles start their life in the sea as plankton and then settle on a hard surface (usually a rock but sometimes piers or boats!) where they stay for the rest of their life. Photo by Herb Wilson.


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