HG_OOSTENDE - Herring gulls (Larus argentatus, Laridae) breeding at the southern North Sea coast (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 HG_OOSTENDE, using trackers developed by the University of Amsterdam Bird Tracking System (UvA-BiTS, http://www.uva-bits.nl). The study has been operational since 2013. In total 55 individuals of European herring gull (Larus argentatus) have been tagged in or near their breeding area at the southern North Sea coast (Ostend and Zeebrugge in Belgium), mainly to study their habitat use. Data are periodically uploaded from the UvA-BiTS database to Movebank and from there archived on Zenodo (see https://github.com/inbo/bird-tracking). Data in this package are exported from Movebank study HG_OOSTENDE - Herring gulls (Larus argentatus, Laridae) breeding at the southern North Sea coast (Belgium) (Movebank Study ID 986040562), which can be viewed at https://www.movebank.org/cms/webapp?gwt_fragment=page=studies,path=study986040562. Attributes in the data files are defined in the README.txt, in the NERC Vocabulary Server at http://vocab.nerc.ac.uk/collection/MVB and in the Movebank Attribute Dictionary at www.movebank.org/node/2381. Files README.txt: information regarding the terms of use and data attributes. HG_OOSTENDE-reference-data.csv: reference data about the animals, tags and deployments. HG_OOSTENDE-gps-yyyy.csv: GPS data recorded by the tags, grouped by year. HG_OOSTENDE-acceleration-yyyy.csv: acceleration data recorded by the tags, grouped by year. ; This dataset was collected using infrastructure provided by VLIZ and INBO funded by Research Foundation - Flanders (FWO) as part of the Belgian contribution to LifeWatch.