Hybrid argentatus x cachinnans .
Posted: Thu Sep 10, 2020 9:55 am
On 4 of September (2020) in Simrishamn SE Sweden I heard the typical call of a cachinnans and to my surprise it came from the bird you can see here.
JanJ
JanJ
Gull Research Organisation - Forum
https://www.talk.gull-research.org/