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

Institutional repository: Repository of the Faculty of Science

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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

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

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

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 16 May 2024, https://urn.nsk.hr/urn:nbn:hr:217:873086

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 May 16] Available at: https://urn.nsk.hr/urn:nbn:hr:217:873086

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

Metadata
TitleThe 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
AuthorAna Tomašić
MentorThomas Bugnyar (mentor)
MentorZoran Tadić (sumentor)
Committee memberZoran Tadić (predsjednik povjerenstva)
Committee memberIvana Buj (član povjerenstva)
Committee memberSven Jelaska (član povjerenstva)
Committee memberZoran Marčić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Biology)
Zagreb
Defense date and country2021-09-28, 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)
Languageenglish
URN:NBNurn:nbn:hr:217:873086
Study programmeTitle: 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 resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2023-09-28
Terms of useLicence In copyright icon
Created on2021-10-14 13:20:49