Photo 9964026, (c) Ansgar Gruber, some rights reserved (CC BY-SA), uploaded by Ansgar Gruber

Attribution © Ansgar Gruber some rights reserved Uploaded by grubio Source iNaturalist Associated observations Photos / Sounds 5 photos What Black-headed Gull (Chroicocephalus ridibundus) Observer grubio Date March 4, 2017 05:35 PM CET Place Konstanz, Deutschland (Google, OSM) Date Added August 23, 2017 10:22 PM CEST Description Chroicocephalus ridibundus at Lake Constance 2 IDs Research Grade View Sizes small medium large original Copyright Copyright 2017 Ansgar Gruber, licensed under CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/)