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 16 of 16 for “"corvids"”.
-
Urban establishment success of corvids
Rabenvögel besiedeln europäische Städte mit unterschiedlichem Erfolg. Das Ziel dieser Arbeit ist es deshalb, Eigenschaften zu ermitteln, die den unterschiedlichen Besiedlungserfolg erklärbar machen. Viele morphologische Arbeiten an Vögeln zeigen, dass die Morphologie mit dem Verhalten und den …
-
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 …
-
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 …
-
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, …
-
A critical evaluation of neophobia in corvids: causes, consequences and conservation implications
… ecological consequences of neophobia to unravel corvids’ puzzling neophobic tendencies. Throughout the thesis I find evidence that corvids are very neophobic, but that individuals differ in their level of novelty avoidance. Neophobia is not a fixed trait across time and towards all types of …
-
Convergent cognitive evolution: what can be learnt from comparisons with corvids and cephalopods?
Emery and Clayton (2004) proposed that corvids (e.g. crows, ravens, jays) may have evolved – convergently with apes – flexible and domain general cognitive tool-kits. In a similar vein, others have suggested that coleoid cephalopods (octopus, cuttlefish, squid) may have developed complex cognition …
-
Recovery of cached food by captive blue jays (Cyanocitta cristata)
Corvids are important seed and nut dispersers in North America. To date, the caching and recovery behaviors of four North American Corvids have been documented, n10st notably Clark1s Nutcracker (Nucifraga columbiana). Blue Jays (Cyanocitta cristata) are important dispersers of Quercus, Fagus, and …
-
Modeling, Dynamics and Optimal Control of West Nile Virus with Seasonality
… differential equations to model the role of corvids and non-corvids birds in the transmission of WNv in the mosquito-bird cycle in a single season and proved the existence of backward bifurcation in the model. In the second part, we consider another deterministic model to study the impact of …
-
An investigation of non-spatial cognitive abilities in an asocial corvid, the Clark's nutcracker (Nucifraga columbiana)
… foragers. To date, cognitive research on corvids has focused on corvids that are highly social and are generalist foragers. From a comparative standpoint, I examined the cognitive abilities of a corvid that is relatively asocial and a specialist forager. The Clarks' nutcracker (Nucifraga …
-
Sentinel behaviour and urban environments: A corvid’s perspective
… in most North American cities. The abundance of corvids has increased with increasing urbanization, suggesting they benefit from living near humans. Recent literature shows that urbanized species such as the American crow can behaviourally adapt to exploit anthropogenic resources resulting in …
-
I See, Therefore I Think - The Role of Observed Realities on Cognition in Rooks (Corvus frugilegus) and African Grey Parrots (Psittacus erithacus)
Within the avian order, corvids and psittacines are those for which evidence of complex cognitive abilities abounds, but rarely are the same tasks given to both. One such ability is secondary representation: entertaining mental models of multiple versions of reality. Secondary representation is …
-
Elements of episodic-like memory in non-human animals: theory, methodology, and evolution
… of this thesis, I extend the work conducted with corvids on the what-where-when paradigm by developing a novel methodology based on the incidental encoding paradigm to test episodic-like memory in Eurasian jays. The jays successfully encoded and recalled incidental visual information associated …
-
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 …
-
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 …