Gulling in Oslo

Thought that I should take a trip to eastern Oslo to look for colorrings and maybe some more exotic species. When it comes to the species I failed to get more than the four that are usual (Herring, great black-backed, common, black-headed), not even the Glaucous was present. When it comes to rings and colorring i managed to read 15 colorrings and 9 metal ones, which is a good number for a days work to foot. No really interesting one, but J3777 hasn't been seen since ringing as pullus this summer until it sat on Vaterland. J3819 was seen on the ice in Bjørvika. This bird isn't seen since I saw it my self at Langvannet in November.