Species: Black-headed Gull (Chroicocephalus ridibundus)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Vesterøya | Vestfold, Norway | 1 | 1 | 0 | 2012-03-29 | |
| Vestliveien 26 | Rogaland, Norway | 1 | 1 | 0 | 2014-01-25 | |
| Vingill | Innlandet, Norway | 4 | 1 | 0 | 2010-05-13 | |
| Wilhelm Færdens vei 4a | Oslo, Norway | 3 | 1 | 0 | 2023-01-28 | |
| Xtrata nikkelverk | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Ytteren | Nordland, Norway | 1 | 1 | 0 | 2009-01-25 | |
| Øksnevadtjørna | Rogaland, Norway | 1 | 1 | 0 | 1994-11-23 | |
| Ørstveitbukta | Telemark, Norway | 1 | 1 | 0 | 2020-04-24 | |
| Østensjø | Oslo, Norway | 1 | 1 | 0 | 2014-03-24 | |
| Øysand | Trøndelag, Norway | 4 | 1 | 0 | 2004-06-09 | |
| Åsevegen 40 | Rogaland, Norway | 1 | 1 | 0 | 2022-01-29 | |
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