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Geological map of the area around the hive (small circle). The shaded area represents the average area explored by the worker bees during their foraging activities during warm weather. Based on a map of the Emilia-Romagna Region available at: http://geoportale.regione.emilia-romagna.it/it/mappe/informazioni-geoscientifiche/geologia/carta-geologica-1-50.000.
