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| Reporter: | Bjørn Rognmo |
| Observers: | Bjørn Rognmo |
| Site: | Oslo lufthavn () |
| Date: | 2018-04-29 |
| Aktivitet: | Spring phenology |
Funn
| Species: | House Martin (Delichon urbicum) | |
| Phenophase: | Arrival | 29.04.2018 |
| Reporter: | Bjørn Rognmo |
| Observers: | Bjørn Rognmo |
| Site: | Oslo lufthavn () |
| Date: | 2018-04-29 |
| Aktivitet: | Spring phenology |
| Species: | House Martin (Delichon urbicum) | |
| Phenophase: | Arrival | 29.04.2018 |