In June 2015, we ringed a juvenile gull in the colony of IJmuiden Forteiland, the Netherlands as Green YBWP. Its father was a presumed hybrid Lesser Black-backed Gull x Yellow-legged Gull (ringed as Green YAHH) and its mother a Lesser Black-backed Gull (ringed as green YASC).
Below: mother Lesser Black-backed Gull Green YASC on the nest with father (presumed) hybrid Lesser Black-backed Gull x Yellow-legged Gull Green YAHH on the left. May 2015, IJmuiden Forteiland, the Netherlands.
In 2016 YBWP returned as a second-calendar year and was seen in the colony as well as in Utrecht.
Above: Green YBWP as a second-calendar year in Utrect. Photo by Mars Muusse, see more of his photos of YBWP on gull-research.org.
In 2017, YBWP revisited the colony and was seen close to the location where it was born.
Above: Green YBWP as a third-calendar year in the gull colony of IJmuiden Forteiland, the Netherlands.
In 2018, YBWP once more returned to the colony but now accompanied by a female Lesser Black-backed Gull. They occupy a territory which is about 15 meters away from the nest where YBWP was born. Father YAHH has also returned to its regular territory (so in sight of YBWP), but with a new partner because unfortunately mother YASC has not been seen since 2015.
It will be interesting to follow them during the coming breeding season.
The following images and video were taken in April 2018: