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| Reporter: | Per Torgersen |
| Observers: | Per Torgersen |
| Site: | Bjørkelangen () |
| Date: | 2021-04-18 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Skylark (Alauda arvensis) | |
| Phenophase: | Arrival | 17.04.2021 |
| Species: | Skylark (Alauda arvensis) | |
| Phenophase: | Birds are singing | 17.04.2021 |
| Species: | Brimstone (Gonepteryx rhamni) | |
| Phenophase: | Adult | 18.04.2021 |
| Species: | Ant (Formica) | |
| Phenophase: | Adult | 17.04.2021 |