O_BALGZAND - Eurasian oystercatchers (Haematopus ostralegus, Haematopodidae) wintering on Balgzand (the Netherlands) is a bird tracking dataset published by Sovon , the University of Amsterdam and the Research Institute for Nature and Forest (INBO) . It contains animal tracking data collected during CHIRP (Cumulative Human Impact on biRd Populations) for the study O_BALGZAND using trackers developed by the University of Amsterdam Bird Tracking System (UvA-BiTS, http://www.uva-bits.nl ). The study was operational from 2010 to 2014. In total 22 individuals of Eurasian oystercatchers ( Haematopus ostralegus ) have been tagged while overwintering in the Balgzand area in the Western Wadden Sea (the Netherlands), mainly to study how they utilize intertidal flats in relation to food availability in winter. Data are uploaded from the UvA-BiTS database to Movebank and from there archived on Zenodo (see https://github.com/inbo/bird-tracking ). No new data are expected. See van der Kolk et al. (2022, https://doi.org/10.3897/zookeys.1123.90623 ) for a more detailed description of this dataset. Data in this package are exported from Movebank study O_BALGZAND - Eurasian oystercatchers (Haematopus ostralegus, Haematopodidae) wintering on Balgzand (the Netherlands) (Movebank Study ID 1605798640), which can be viewed at https://www.movebank.org/cms/webapp?gwt_fragment=page=studies,path=study1605798640 . Fields in the data follow the Movebank Attribute Dictionary ( http://vocab.nerc.ac.uk/collection/MVB ) and are described in <code>datapackage.json</code>. Files Files are structured as a Frictionless Data Package . You can access all data in R via <code>https://zenodo.org/record/8238649/files/datapackage.json</code> using frictionless . datapackage.json : technical description of the data files. O_BALGZAND-reference-data.csv : reference data about the animals, tags and deployments. O_BALGZAND-gps-yyyy.csv.gz : GPS data recorded by the tags, grouped by year. O_BALGZAND-acceleration-yyyy.csv.gz : ...