The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective

Tomašić, Ana

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master's thesis

The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective

Zagreb: University of Zagreb, Faculty of Science, 2021. urn:nbn:hr:217:873086

Tomašić, Ana

University of Zagreb
Faculty of Science
Department of Biology

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APA 6th Edition

Tomašić, A. (2021). The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:873086

MLA 8th Edition

Tomašić, Ana. "The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective." Master's thesis, University of Zagreb, Faculty of Science, 2021. https://urn.nsk.hr/urn:nbn:hr:217:873086

Chicago 17th Edition

Harvard

Tomašić, A. (2021). 'The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective', Master's thesis, University of Zagreb, Faculty of Science, accessed 29 June 2024, https://urn.nsk.hr/urn:nbn:hr:217:873086

Vancouver

Tomašić A. The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2021 [cited 2024 June 29] Available at: https://urn.nsk.hr/urn:nbn:hr:217:873086

IEEE

A. Tomašić, "The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:217:873086

Cite this item: https://urn.nsk.hr/urn:nbn:hr:217:873086

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Title	The ability of ravens (Corvus corax Linnaeus, 1758) to evaluate human behavior from a bystander perspective
Title (croatian)	Sposobnost gavrana (Corvus corax Linnaeus, 1758) za procjenu ponašanja ljudi iz perspektive promatrača
Author	Ana Tomašić
Mentor	Thomas Bugnyar (mentor)
Mentor	Zoran Tadić (sumentor)
Committee member	Zoran Tadić (predsjednik povjerenstva)
Committee member	Ivana Buj (član povjerenstva)
Committee member	Sven Jelaska (član povjerenstva)
Committee member	Zoran Marčić (član povjerenstva)
Granter	University of Zagreb Faculty of Science (Department of Biology) Zagreb
Defense date and country	2021-09-28, Croatia
Scientific / art field, discipline and subdiscipline	NATURAL SCIENCES Biology
Abstract	Ravens (Corvus corax) have a complex social structure with various interaction between individuals. Predicting the behavior of others based on observation would be advantageous for future interactions. While previous studies showed that ravens can discriminate between human experimenters after direct interaction, I was interested to see if they would be able to do so when put in a bystander position. In this study, individual ravens could observe two experimenters engaging in the retrieval of their food previously cached or in the pilfering of the other’s cache. Two experimenters (pilferer or retriever versus a neutral person) offered food and each raven had the choice to take the food from one of them. Contrary to expectation, the ravens did not choose one experimenter significantly over the other. Yet, when comparing their choices made before and after the observation, I found a tendency to discriminate. Furthermore, the ravens changed their visual behavior (head turns) across the phase types of a trial, but not between the conditions. This study produced equivocal results, which might be caused by small sample size. Further investigation is needed to confirm whether ravens are capable to understand displayed human interaction and what behavioral actions ravens are paying attention to.
Abstract (croatian)	Gavrani (Corvus corax) imaju složenu socijalnu strukturu u kojoj su jedinke izložene različitim situacijama u interakciji s drugim jedinkama. Stoga, predviđanje ponašanja drugih, pomoću informacija dobivenih opažanjem, može biti korisno u budućim interakcijama. Kako su u prijašnjim studijama gavrani razlikovali ljude nakon direktne interakcije s njima, zanimalo me mogu li razlikovati ljude i iz pozicije promatrača. U ovom eksperimentu, svaki je gavran promatrao dva izvođača pokusa koji su ili uzeli hranu koju su sami prethodno sakrili ili su ukrali hranu iz skrovišta drugog izvođača pokusa. Naknadno, dva izvođača pokusa (kradljivac ili osoba koja je uzela svoju hranu natrag i neutralna osoba) ponudili su hranu gavranu, koji je potom odabrao od koga uzeti hranu. Suprotno predviđanjima, gavrani nisu odabrali niti jednog izvođača pokusa značajno više od drugih. Ipak, analiza njihovih odabira prije i nakon promatranja pokazuje da imaju sklonost razlikovanju osoba. Također, gavrani su promijenili svoje ponašanje (okretaji glavom) kroz pojedine faze pokusa, ali ne i kroz tip pokusa. U konačnici, ovo istraživanje je dalo dvosmislene rezultate, vjerojatno zbog male veličine uzorka. Potrebna su dodatna istraživanje kako bi se potvrdilo jesu li gavrani sposobni razumjeti prikazanu ljudsku interakciju i na koje njene elemente obraćaju pozornost.
Keywords
Keywords (croatian)
Language	english
URN:NBN	urn:nbn:hr:217:873086
Study programme	Title: Ecology Study programme type: university Study level: graduate Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
Type of resource	Text
File origin	Born digital
Access conditions	Open access Embargo expiration date: 2023-09-28
Terms of use
Repository	Repository of the Faculty of Science
Created on	2021-10-14 13:20:49