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| Rapportør: | Per Torgersen |
| Observatører: | Per Torgersen |
| Site: | Bjørkelangen () |
| Date: | 2021-04-21 |
| Aktivitet: | Spring phenology |
Funn
| Art: | Chiffchaff (Phylloscopus collybita) | |
| Phenophase: | Arrival | 20.04.2021 |
| Art: | Chiffchaff (Phylloscopus collybita) | |
| Phenophase: | Birds are singing | 20.04.2021 |
| Art: | Alpine Penny-cress (Noccaea caerulescens) | |
| Phenophase: | Flowering | 21.04.2021 |