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 <code>README.txt</code>, 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.