Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Corvid"”.
-
The sociality, ontogeny, and function of corvid post-conflict affiliation
… that differences in sociality would influence corvid postconflict affiliation, and that this behaviour would change as individuals developed from juveniles to adults. I predicted that social rooks (Corvus frugilegus) and jackdaws (C. monedula), but not the less social Eurasian jays (Garrulus …
-
An investigation of non-spatial cognitive abilities in an asocial corvid, the Clark's nutcracker (Nucifraga columbiana)
… the cognitive abilities of birds in the family Corvidae (crows and jays) are comparable in many aspects to that of apes. Scientists have posited competing hypotheses to explain how complex cognitive abilities arise in a species or group of animals. One such hypothesis, the social-intelligence …
-
CROW - CultuRal co-evOlution of corvids: Winged omens of the times
Corvids – birds of the crow family, including ravens, crows, jackdaws, magpies, jays and choughs – are among the most ubiquitous and intelligent birds in the world. Their adaptability to anthropogenic environments and omnivorous scavenging makes them commensal and synanthropic species in both urban …
-
CROW - CultuRal co-evOlution of corvids: Winged omens of the times
Corvids – birds of the crow family, including ravens, crows, jackdaws, magpies, jays and choughs – are among the most ubiquitous and intelligent birds in the world. Their adaptability to anthropogenic environments and omnivorous scavenging makes them commensal and synanthropic species in both urban …
-
Eavesdropping on speech in wild carrion crows
… investigate this response to speech in another corvid species, the carrion crow (Corvus corone). I found that wild carrion crows in both London and Milton Keynes responded to speech with increased vigilance compared to parakeet and pigeon calls (non-speech control vocalizations), but they did …
-
A multi-facetted approach to investigating theory of mind in corvids
… and carrion crows (Corvus corone corone). Corvids have been reported to possess theory of mind-like abilities. This qualification reflects the fact that most research on theory of mind in these birds has revolved around the ability to respond to perceptual and desire states of conspecifics, …
-
The development of caching behavior, cache site and cache item defense tactics, and cache site and cache item sharing in orphaned fledgling blue jays (<i>cyanocitta cristata</i>) at a songbird rehabilitation center
… As caching serves an important function in corvid life, this study sought to determine if this behavior would develop with or without outside input. Eight orphaned blue jays (consisting of both hatchlings and nestlings) were brought into the care of the Bird Center of Washtenaw County, Inc. …
-
Understanding predation of tortoises by nesting Pied Crows (Corvus albus) in western South Africa
… interacted. As generalist predators, corvids are a potential threat to other species in areas where they have recently colonized or where their numbers have increased. Tortoise species appear to be one taxonomic group that may potentially suffer serious negative effects from increased …
-
A critical evaluation of neophobia in corvids: causes, consequences and conservation implications
… in the environment. However, birds within the corvid family ($\textit{Corvidae}$) defy this trend by being highly neophobic, yet highly successful alongside humans across diverse habitats. This thesis examines the causes and ecological consequences of neophobia to unravel corvids’ puzzling …
-
Sociality, social learning and individual differences in rooks, jackdaws and Eurasian jays
… thesis investigated social learning in three corvid species: gregarious rooks (Corvus frugilegus) and jackdaws (Corvus monedula) and nongregarious, territorial Eurasian jays (Garrulus glandarius). In addition to that, the species' social structure was analysed and individual differences …
-
Vocal responses of Blue Jays (Cyanocitta cristata) to raptors that differ in predatory threat
… studies have revealed that two species in the corvid family, American Crows (Corvus brachyrhynchos) and Siberian Jays (Perisoreus infaustus), use referential calls to convey information about predator presence and level of threat. Because of their intelligence and flocking behavior, Blue Jays, …
-
Replication, bias, and meta-research in animal cognition research
… risk-of-bias assessment of the entire corvid social cognition literature. And in Chapter 7, I led a team assessing how researchers in animal cognition report and interpret non-significant statistical results, as well as the p-value distributions of non-significant results across a …
-
The Impacts of Corvids on Biodiversity
Corvids are often referred to as efficient nest predators with potential negative impacts on biodiversity. Despite the plethora of literature focusing on the impact of corvids on their potential prey, no review has been conducted on the genus Corvus to synthesis these relationships, and to explore …
-
A comparative analysis of auditory perception in songbirds: Eurasian jays (Garrulus glandarius) and great tits (Parus major)
In the field of comparative cognition, auditory perception has received less study than its visual counterpart, yet it confers important survival benefits. Accurate responses to auditory stimuli enable animals to react to or interact with the stimulus. Vocal communication between and within species …
-
A comparative investigation of the attribution of desires and preferences
Although it is widely accepted that adult humans possess a ‘theory of mind’, debate has surrounded whether non-human animals may also be capable of attributing mental states such as knowledge, beliefs and desires to others. While researchers agree that animals are unlikely to possess a human-like …
-
Modelling mitigation of bird population declines in the UK through landscape-scale environmental management.
… poor bird habitat. The MDS analysis showed that corvids were strongly associated with these edge habitats creating an exclusion zone. An increase in the proportional length of woody hedge vegetation in field boundaries supported more declining bird species than the other habitats. Hedges also …
-
Impacts of non-renewable resource extraction on shrubland songbird nest success and abundance
… had higher nest survival due to lower rodent and corvid nest predator abundances. This research informs conservation efforts of the declining early-successional songbird guild and answers questions about the impacts of common energy extraction practices on these species. Blue-winged Warblers …