Reakce krkavce velkého (\kur{Corvus} corax) na heterospecifické varovné hlasy

The following work encompasses a research in the behaviour of the common raven (Corvus corax). I tested the responses of the common raven to heterospecific alarm calls of various bird species that differ in familiarity and taxonomical relatedness to ravens. Two other corvid species (jays) and two non-corvids (gulls) were presented. The ravens were given stimuli from one jay and one gull - one of which was always familiar to the tested ravens (European) and one unfamiliar (American). The results suggest that familiarity is not as important as the membership to the Corvidae family.