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| Rapportør: | Hjalmar Larsen |
| Observatører: | Hjalmar Larsen |
| Site: | Nordmarka () |
| Date: | 2020-05-24 |
| Aktivitet: | Spring phenology |
Funn
| Art: | Chiffchaff (Phylloscopus collybita) | |
| Phenophase: | Birds are singing | 24.05.2020 |
| Art: | Willow Warbler (Phylloscopus trochilus) | |
| Phenophase: | Arrival | 24.05.2020 |
| Art: | Willow Warbler (Phylloscopus trochilus) | |
| Phenophase: | Birds are singing | 24.05.2020 |