LBBG_ADULT - Lesser black-backed gulls (Larus fuscus, Laridae) breeding in Belgium is a bird tracking dataset published by the Research Institute for Nature and Forest (INBO) . It contains animal tracking data collected by the LifeWatch GPS tracking network for large birds ( http://lifewatch.be/en/gps-tracking-network-large-birds ) for the project/study LBBG_ADULT , using trackers developed by Ornitela ( https://www.ornitela.com ). The study has been operational since 2022. In total 39 individuals of lesser black-backed gull ( Larus fuscus ) have been tagged in the breeding colony of Zeebrugge in Belgium, mainly to study their habitat use and migration behaviour. Data are automatically synced with Movebank and from there periodically archived on Zenodo (see https://github.com/inbo/bird-tracking ). Files Data in this package are exported from Movebank study 2298738353 . Fields in the data follow the Movebank Attribute Dictionary and are described in <code>datapackage.json</code>. Files are structured as a Frictionless Data Package . You can access all data in R via <code>https://zenodo.org/records/12622252/files/datapackage.json</code> using frictionless . datapackage.json : technical description of the data files. LBBG_ADULT-reference-data.csv : reference data about the animals, tags and deployments. LBBG_ADULT-gps-yyyy.csv.gz : GPS data recorded by the tags, grouped by year. Acknowledgements This dataset was collected using infrastructure provided by INBO and funded by Research Foundation - Flanders (FWO) as part of the Belgian contribution to LifeWatch. ; This version adds data from 2023 and references the latest Movebank Attribute Dictionary.