Photo 18447263, (c) Harlan Svoboda, some rights reserved (CC BY-NC), uploaded by Harlan Svoboda

Attribution © Harlan Svoboda some rights reserved Uploaded by htsvoboda Source iNaturalist Associated observations Photos / Sounds What Great Black-backed Gull (Larus marinus) Observer htsvoboda Date July 30, 2011 11:38 AM EDT Place Cape Cod National Seashore, Provincetown, MA, US (Google, OSM) Date Added May 23, 2018 07:40 AM EDT 3 IDs Research Grade View Sizes small medium large original