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| Reporter: | Marit Jahren |
| Observers: | Marit Jahren |
| Site: | Kastellet () |
| Date: | 2011-04-20 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Brambling (Fringilla montifringilla) | |
| Phenophase: | Arrival | 19.04.2011 |
| Species: | Blackcap (Sylvia atricapilla) | |
| Phenophase: | Arrival | 20.04.2011 |