4cy-smith look-alike, Iceland
Posted: Sun Dec 23, 2018 6:15 pm
Here is an example of dark 4cy-herring gull potographed by Alex Máni in SW-Iceland, 7.1.2017. It has much black in the tail and the secondaries.
Gull Research Organisation - Forum
https://www.talk.gull-research.org/
https://www.talk.gull-research.org/viewtopic.php?f=37&t=1224