Photo 1413800, (c) Duarte Frade, some rights reserved (CC BY), uploaded by Duarte Frade

Attribution © Duarte Frade some rights reserved Uploaded by duarte Source BioDiversity4All Associated observations Photos / Sounds 2 photos What Great Black-backed Gull (Larus marinus) Observer duarte Date December 10, 2014 Place Porto, Porto, Portugal (Google, OSM) Date Added December 10, 2014 05:25 PM WET Description Huge, unmistakable gull. Tags Larus marinus, Porto, Oporto, Portugal 2 IDs Research Grade View Sizes small medium large original Copyright