Photo 717241, (c) Liam O'Brien, some rights reserved (CC BY-NC), uploaded by Liam O'Brien

Attribution © Liam O'Brien some rights reserved Uploaded by robberfly Source iNaturalist Associated observations Photos / Sounds What Pacific Acorn Barnacle (Balanus glandula) Observer robberfly Date March 11, 2014 12:15 PM PDT Place 455 Berry St, San Francisco (Google, OSM) Date Added March 11, 2014 02:29 PM PDT 2 IDs Research Grade View Sizes small medium large original