Photo 5937406, (c) Mark Rosenstein, some rights reserved (CC BY-NC), uploaded by Mark Rosenstein

Attribution © Mark Rosenstein some rights reserved Uploaded by maractwin Source iNaturalist Associated observations Photos / Sounds What Great Black-backed Gull (Larus marinus) Observer maractwin Date January 2, 2017 01:52 PM EST Place West Cambridge, Cambridge, MA, USA (Google, OSM) Date Added January 2, 2017 03:14 PM EST Tags birds, cambridge, fresh pond, great black-backed gull 3 IDs Research Grade View Sizes small medium large original