Migratory bird phenology from Grimsö Research Area, 1985–2025 sites-kb0beoo1fzf8ahmjc4qlbjbz-0 Swedish National Data Service Svensk nationell datatjänst Migratory bird phenology from Grimsö Research Area, 1985–2025 sites-kb0beoo1fzf8ahmjc4qlbjbz-0 Grimsö Wildlife Research Station Swedish National Data Service Svensk nationell datatjänst The date of the first observation of regionally common migratory birds within the Grimsö Wildlife Research Area (GWRA) has been recorded annually since 1985. Species observations (visual and/or auditory) are noted on a central list by any staff member. Observations are not made during a dedicated survey but can be made during field work, commuting, free time etc., but must occur within GWRA. The survey runs continuously, but data is compiled yearly. Grimsö Wildlife Research Station (2025). Migratory bird phenology from Grimsö Research Area, 1985–2025 [Data set]. Swedish Infrastructure for Ecosystem Science (SITES). https://hdl.handle.net/11676.1/Kb0BEoo1fzF8aHMJC4qlbJBZ Access to data through an external actor. Åtkomst till data via extern aktör.