Paul Brooks
Well-known member
Just watching an adult Herring Gull here in Northumberland UK and I have a question about wing-tip patterns. How much of a feature is the lack of a p10 sub-terminal band for argentatus? The bird I'm watching has no sub-terminal band on p10, giving it a large white tip rather than a p10 mirror. it has a mirror plus white tip on p9.
Am I reading too much into this as a feature or is the large white tip but no mirror an important argentatus feature?
Cheers.
Am I reading too much into this as a feature or is the large white tip but no mirror an important argentatus feature?
Cheers.