MH_ANTWERPEN - Western marsh harriers (Circus aeruginosus, Accipitridae) breeding near Antwerp (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 MH_ANTWERPEN, using trackers developed by the University of Amsterdam Bird Tracking System (UvA-BiTS, http://www.uva-bits.nl). The study has been operational since 2018. In total 3 individuals of western marsh harriers (Circus aeruginosus) have been tagged in their breeding area near the city of Antwerp (Belgium), mainly to study their habitat use and migration behaviour. 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 MH_ANTWERPEN - Western marsh harriers (Circus aeruginosus, Accipitridae) breeding near Antwerp (Belgium) (Movebank Study ID 938783961), which can be viewed at https://www.movebank.org/cms/webapp?gwt_fragment=page=studies,path=study938783961. 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. MH_ANTWERPEN-reference-data.csv: reference data about the animals, tags and deployments. MH_ANTWERPEN-gps-yyyy.csv: GPS data recorded by the tags, grouped by year. MH_ANTWERPEN-acceleration-yyyy.csv: acceleration data recorded by the tags, grouped by year. ; This dataset was collected using infrastructure provided by INBO and funded by Research Foundation - Flanders (FWO) as part of the Belgian contribution to LifeWatch.