<p>&lt;em&gt;H_GRONINGEN - Western marsh harriers (Circus aeruginosus, Accipitridae) breeding in Groningen (the Netherlands)&lt;/em&gt; is a bird tracking dataset collected by the &lt;a href="https://grauwekiekendief.nl/"&gt;Grauwe kiekendief - Kenniscentrum Akkervogels (GKA)&lt;/a&gt; / Dutch Montagu's Harrier Foundation and published by the &lt;a href="https://www.inbo.be/en"&gt;Research Institute for Nature and Forest (INBO)&lt;/a&gt;. It contains animal tracking data collected for the project/study &lt;strong&gt;H_GRONINGEN&lt;/strong&gt;, using trackers developed by the University of Amsterdam Bird Tracking System (UvA-BiTS, &lt;a href="http://www.uva-bits.nl"&gt;http://www.uva-bits.nl&lt;/a&gt;). The study was operational from 2012 until 2018. In total 4 individuals of western marsh harriers (&lt;em&gt;Circus aeruginosus&lt;/em&gt;) have been tagged in their breeding area in the province Groningen (the Netherlands) close to the Netherlands-Germany border, mainly to study their habitat use and migration behaviour. Data are uploaded from the UvA-BiTS database to Movebank and from there archived on Zenodo (see &lt;a href="https://github.com/inbo/bird-tracking"&gt;https://github.com/inbo/bird-tracking&lt;/a&gt;). No new data are expected.</p><p>See Milotic et al. (2020, &lt;a href="https://doi.org/10.3897/zookeys.947.52570"&gt;https://doi.org/10.3897/zookeys.947.52570&lt;/a&gt;) for a more detailed description of this dataset.</p><p>Data have been standardized to Darwin Core using the &lt;a href="https://inbo.github.io/movepub/"&gt;movepub&lt;/a&gt; R package and are downsampled to the first GPS position per hour. The original data are available in Koks et al. (2023, &lt;a href="https://doi.org/10.5281/zenodo.10053658"&gt;https://doi.org/10.5281/zenodo.10053658&lt;/a&gt;), a deposit of Movebank study &lt;a href="https://www.movebank.org/cms/webapp?gwt_fragment=page=studies,path=study922263102"&gt;922263102&lt;/a&gt;.</p>