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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
How the red-backed shrike (Lanius collurio) recognizes enemies
 NĚMEC, Michal
This study investigates two questions about anti-predator behaviour of the red-backed shrike. 1) Is the red-backed shrike able to assess the differing dangers represented by various types or species of predators? 2) How does the red-backed shrike recognize the predator? We found, that the red-backed shrike (Lanius collurio) adjusts its anti-predator behaviour by assessing the potential threat to themselves from different predator species and by assessing the chance of a successful attack. Further, we found that the presence of general raptor salient features is absolutely necessary for proper categorisation of the intruder as a predator, whereas the natural species-specific colouration in itself is an insufficient cue.
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The effect of the conspecific alarm vocalization on the form and intensity of antipredator behaviour of the Red-backe Shrike (\kur{Lanius collurio})
 MINAŘÍK, Tomáš
I examined the effect of the conspecific mobbing call of the Red-backed Shrike (Lanius collurio) on nest defence against arial predator (kestrel). I used a playback experiment in the presence of a dummy of kestrel (Falco tinnunculus) in two variants either with nature look or with adjusted key features (pigeon beak, claws and eyes), and pigeon (Columba palumbus) as a control. Shrikes were attracted by the mobbing call and arrived to their nests faster. Only the modified kestrel was attacked more likely in the presence of the playback, that suggests possible function of the mobbing call as a cue for social learning of predator recognition.
Detailed record
Which information is included in the alarm call of Red-backed Shrike \kur{(Lanius collurio)}?
 MINAŘÍK, Tomáš
The first complex study of the alarm vocalisation of the Red-backed Shrike (Lanius collurio) is presented. Following on from previous studies five stuffed dummies ? Eurasian Sparrowhawk (Accipiter nisus), Common Kestrel (Falco tinnunculus), Eurasian Jay (Garrulus glandarius), European Magpie (Pica pica), and Common Wood Pigeon (Columba palumbus) ? were used to elicit antipredation behaviour. Seven different types of alarm calls are described ? besides the commonly used ?chak?, five mobbing calls and one that possibly warns conspecifics.
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