Herring Gulls #2

Herring Gulls #2

Observation - Herring Gulls #2. Description: The bird on the right has the autumn/winter grey streaking, whereas the bird on the left has the summer plumage's white head. Are such plumage differences down to individual variation?

The bird on the right has the autumn/winter grey streaking, whereas the bird on the left has the summer plumage's white head. Are such plumage differences down to individual variation?