Caspian Gulls are observed several times in Mandal, and here are some photos of the last Caspian Gull seen in Mandal 25. October 2011. The bird stayed in Mandalselva several days. This is a second year bird (2cy)
The white head is diagnostic as well as the white tail visible at the second photo. The wing pattern is also important to distinguish Caspian from Yellow-legged Gull.