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| Reporter: | Egil Bruvold |
| Observers: | Egil Bruvold |
| Site: | Grorud () |
| Date: | 2011-04-01 |
| Aktivitet: | Spring phenology |
Funn
| Species: | Black-headed Gull (Chroicocephalus ridibundus) | |
| Phenophase: | Arrival | 01.04.2011 |
| Comments: | ankomst |
| Reporter: | Egil Bruvold |
| Observers: | Egil Bruvold |
| Site: | Grorud () |
| Date: | 2011-04-01 |
| Aktivitet: | Spring phenology |
| Species: | Black-headed Gull (Chroicocephalus ridibundus) | |
| Phenophase: | Arrival | 01.04.2011 |
| Comments: | ankomst |