Abstract
Accurate recognition of a predator is the necessary precondition for adequate antipredatory behaviour. We used feeder experiments to examine whether birds adopt the appropriate antipredatory response according to the level of threat posed by predators. The results support the idea that the tits made a decision on the threat level. The tits distinguished among equally sized obligatory predators (sparrowhawk, kestrel), an occasional predator (jay) and a harmless bird of similar size (pigeon) and a smaller harmless bird (thrush). The presence of both birds of prey was associated with a considerable reduction in the number of feeder visits when compared with the harmless birds. The number of visits to the feeder that had a dummy jay positioned on it did not significantly differ for harmless birds or for predators. Different sizes of harmless birds did not influence the tits’ behaviour. The increasing risk lowered not only the number of visits to the feeder but also the success of the visit, pecking rate, and the direction of arrival to the feeder. Generally, birds assessed the risk during food searching, evaluated the situation, and adapted their behaviour accordingly.
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Acknowledgments
We are grateful to the anonymous reviewers for their truly helpful comments that have driven us to review once again. I am also grateful to Philip Butterill and Legi Sam for their comments, and support during my work on manuscript. The study was financially supported by grants of the Academy of Sciences of the Czech Republic (IAA601410803), and the Ministry of Education, Youth, and Sports (MSM6007665801).
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Tvardíková, K., Fuchs, R. Tits recognize the potential dangers of predators and harmless birds in feeder experiments. J Ethol 30, 157–165 (2012). https://doi.org/10.1007/s10164-011-0310-0
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DOI: https://doi.org/10.1007/s10164-011-0310-0