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| Rapportør: | Einar Balle |
| Observatører: | Einar Balle |
| Site: | Gullberg () |
| Date: | 2021-04-13 |
| Aktivitet: | Spring phenology |
Funn
| Art: | Chiffchaff (Phylloscopus collybita) | |
| Phenophase: | Arrival | 12.04.2021 |
| Art: | Chiffchaff (Phylloscopus collybita) | |
| Phenophase: | Birds are singing | 12.04.2021 |