Fig. 1

The field site, where ravens were tagged with GPS-transmitters, is situated at the northern edge of the Eastern Alps in Austria, indicated with a red star. The location of 45 anthropogenic food sources that were identified in this area are shown as points, grouped by resource type, against the background elevation. Major cities are indicated as white and black circles. The box in the upper left corner shows the field site in Austria and the countries neighbouring Austria. Thick black lines show the country borders while thin black lines depict country states