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National Repository of Grey Literature

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Role znaků a geonů v rozpoznávání predátorů netrénovanými ptáky: obrana hnízda NOVÁKOVÁ, Nela I examined two main hypotheses proposed for the object recognition: Particulate feature theory and recognition by components using methods of behavioural ecology, namely nest defence. We tested reactions of Red-backed shrike (Lanius collurio) to dummies of Common kestrel (Falco tinnunculus) with scrambled body parts (head above, in the middle and at the bottom). Our result suggested that birds don't recognize the kestrel in the dummies with inappropriately placed head. Therefore, our results support rather the theory recognition by components. Detailed record

Role of features and geons in predator recognition by untrained birds: the feeder experiments NOVÁKOVÁ, Nela The mechanism of predator recognition in birds hasn't been understood well yet. There are two main hypotheses: recognition by components and particulate feature theory. We examined these theories in two-feeder experiment under natural conditions on wild untrained birds. We tested reactions of great tit (Parus major), blue tit (Cyanistes caeruleus), marsh tit (Poecile palustris), willow tit (Poecile montanus) and Eurasian nuthatch (Sitta europaea) to dummies of scrambled sparrow hawk (Accipiter nisus) compared to control complete sparrow hawk and pigeon (Columba livia f. domestica). Our results suggested that birds assesss all scrambled dummies equally as a real unscrambled sparrowhawk. Therefore our results support rather the particulate feature theory. Detailed record

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