Abstract (eng)
As feeding generalists, both subspecies of carrion crows (Corvus corone corone, C. c. cornix) are common in the area of Vienna Zoo. Anecdotal reports suggest that foraging crows frequently interact with both the visitors and the Zoo animals. The aim of this study was to investigate the foraging strategies of crows, focusing on individual preferences for given feeding techniques and specific sites within the Zoo. Crows were captured with drop-in traps, measured, sexed and individually marked with leg bands. In addition, each bird was subjected to a tonic immobility test, measuring its propensity for actively dealing with an unpleasant situation and allowing us to characterize whether individuals are fast or slow at coping with an experimental challenging situation. Tagged birds were observed on a daily basis for five months using a combination of focal, scan and ad-lib sampling. Results show that crows have individual preferences for using particular areas of the Zoo and, within these areas, for using specific enclosures. Interestingly, these preferences are dependent on the birds’ social class (breeder/ non-breeder) and copying style. These findings suggest that the crows prefer certain locations.