3rd cy dark herring gull
Posted: Wed Dec 26, 2018 9:43 pm
Example of an dark 3rd-cy herring gull, photographed in Grindavík, SW-Iceland, on the 4rth of December 2018 by Stefán Áki Ragnarsson. Note the sooty dark head and underparts.
Gull Research Organisation - Forum
https://www.talk.gull-research.org/
https://www.talk.gull-research.org/viewtopic.php?f=37&t=1227