LBBG 7cyEJ17, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). 

Ringed July 08 1996 near the current breeding spot of ECT.

An example of a female which moved to another colony (< 5 km's). As a thumb rule, the males return to the colonies where they were raised, while the females may disperse to other colonies. In a research about Herring Gulls, approximately 75% of the male and about 40% of the females in their adult plumage returned to the original colony (H. Vercruijsse).