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Ride bestand choice of roosting habitat competitive behavior density distributions drone inter-species interactions skarv spatiotemporal positioning Avian flu Biodiversity Breeding and migratory birds H5N1 HPAI Highly pathogenic avian influenza virus Monitoring Scientific research Seabird conservation Sero-surveillance Wildlife disease management ducks ederfugl flock structure geese havørn lomvie waders Alk Havørn Pasteurella multocida