Photo 49247190, (c) Diana V. Tretyakova, some rights reserved (CC BY-NC), uploaded by Diana V. Tretyakova

Attribution © Diana V. Tretyakova some rights reserved Uploaded by divitre Source iNaturalist Associated observations Photos / Sounds What Black-headed Gull (Chroicocephalus ridibundus) Observer divitre Date August 16, 2019 08:51 AM +04 Place Петровская Гавань, Кронштадт, Санкт-Петербург, RU (Google, OSM) Date Added August 25, 2019 03:33 PM +04 2 IDs Research Grade View Sizes small medium large original