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| Reporter: | Olav Hagen |
| Observers: | Olav Hagen |
| Site: | Underlia, Drammen () |
| Date: | 2021-04-21 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Song Thrush (Turdus philomelos) | |
| Phenophase: | Arrival | 16.04.2021 |
| Species: | Common Blackbird (Turdus merula) | |
| Phenophase: | Arrival | 16.04.2021 |