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| Reporter: | Hjalmar Larsen |
| Observers: | Hjalmar Larsen |
| Site: | Nordmarka () |
| Date: | 2021-05-21 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Willow Warbler (Phylloscopus trochilus) | |
| Comment: | Sett og hørt | |
| Phenophase: | Birds are singing | 21.05.2021 |
| Reporter: | Hjalmar Larsen |
| Observers: | Hjalmar Larsen |
| Site: | Nordmarka () |
| Date: | 2021-05-21 |
| Aktivitet: | Spring phenology |
| Species: | Willow Warbler (Phylloscopus trochilus) | |
| Comment: | Sett og hørt | |
| Phenophase: | Birds are singing | 21.05.2021 |