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| Reporter: | Norsk Ornitologisk Forening |
| Observers: | Arve Dyresen (LRSK Østfold) |
| Site: | Krokstadfjorden () |
| Date: | 2006-04-20 |
| Registered: | 2006-04-24 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Common Tern (Sterna hirundo) | |
| Phenophase: | Arrival | 20.04.2006 |