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.
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Showing 1 to 20 of 20 for “"Parrots"”.
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Population Increase and Range Expansion of Three Psittacids in Florida and California
… California and Florida. Most of these species of parrots have small populations that are probably a result of continual accidental and intentional releases, but at least three parrot species are believed to have self-sustaining breeding populations. They are the Monk Parakeet (<em>Myiopsitta …
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I See, Therefore I Think - The Role of Observed Realities on Cognition in Rooks (Corvus frugilegus) and African Grey Parrots (Psittacus erithacus)
… comparable to previous studies with African grey parrots (Psittacus erithacus). Like parrots, one rook also demonstrated full Stage 6b (multiple invisible displacements), including evidence of representation, whereas other individuals ranged between Stage 5a (single visible displacements) and 6a …
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Development of a potential challenge model and plant-produced vaccine candidate for beak and feather disease virus
… has been reported in wild endangered Cape parrots (Poicephalus robustus), which is endemic to South Africa. No treatment or vaccine is commercially available. In this study, an investigation into the outbreak was undertaken. BFDV diversity was assessed and viral load and clinical signs …
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The evolutionary roots of vocal learning: Exploring vocal learning abilities in vocal non-learners in birds
… groups of birds are vocal learners in birds: parrots, hummingbirds, and songbirds (oscines). In birds, there is also compelling evidence that suboscines that share a common ancestor with parrots and oscines have rudimentary vocal learning abilities. To better understand how vocal learning …
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Conservation Taxonomy of the Cuban Parrot: Morphological, Plumage and Flight Call Variation
… characters from the flight calls of 23 parrots representing all six extant populations. I relied largely on discriminate function analyses (DFA) to assess diagnosability and examine patterns of similarity among the populations.</p> <p>Most morphological characters indicated sexual …
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Characterization of avipoxviruses for use in recombinant vaccines
… and characterised from fowls, quails, canaries, parrots and lovebirds. This work describes the first isolation of a poxvirus from Jackass penguins (Spheniscus dermersus) and the characterisation of the virus as a separate species of penguinpox virus.
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Elements of episodic-like memory in non-human animals: theory, methodology, and evolution
… by testing a non-caching avian group: the parrots. I test various parrot species with the same methodology used to test the jays, so that their performance can be directly compared. The parrots failed to encode or recall incidental visual ‘cache’ information, possibly supporting the caching …
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Charles Dickens' Trope of Great Gulfs: Irony in Bleak House
… base without supporting it. Dickens also parrots many of Carlyle's ideas when he uses the language of servitude and slavery to differentiate the Great Gulfs between a strong work ethic and one that is weak. It is Dickens' language in Bleak House that exposes his disdain for England's …
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The Relationship Between Salivary Cortisol Levels and Stressful Behaviors upon the Introduction of a New Exhibit Mate in Captive Black and Gold Howler Monkeys (<i>Alouatta caraya</i>) at the Hattiesburg Zoo
… a secondary introduction phase where four Macaw parrots were introduced into the exhibit, and a return to the third phase when the birds were removed. Behavior observations and salivary cortisol levels were also analyzed with regards to the four phases of the introduction.</p> <p>Introduction …
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Animal madness : a natural history of disorder
… to, more recently, obsessive-compulsivity in parrots and PTSD in military dogs, demonstrates that other animals have acted as mirrors and proxies for disordered Anglo-American minds for more than a century. Drawing upon archival sources, published literature in the fields of ethology, …
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Molecular Evolution and Functional Characterization of the Visual Pigment Proteins of the Great Bowerbird (Chlamydera nuchalis) and Other Vertebrates
… mediating UV/violet vision in passerines and parrots is elucidated in this chapter using site-directed mutagenesis, protein expression, and phylogenetic recreation of ancestral opsins. While cone opsins mediate colour vision in bright light, the rhodopsin visual pigment contained in rod …
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Oriental Contributions to Franciscan Art in the Thirteenth and Fourteenth Centuries
… textiles—rich with dragons, phoenixes, and parrots—were integrated into Franciscan liturgical spaces. Though seemingly at odds with the Franciscan ideal of poverty, these luxurious fabrics were re-sacralized as signs of divine splendor, their Oriental motifs reinterpreted through Western …
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A Question of Luxury: Trading Animals and Animal Parts Across the Indian Ocean
… of animals such as Indian hounds, peafowl, parrots, monkeys, and others that are attributed to the trade across the Indian Ocean. Likewise, this demand is noted to have existed at such high levels that it led to the decline of many Mediterranean species. In terms of animal parts, it is often …
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Learning words : comparing two-year-olds’ learning success in dyadic and triadic teaching situations embedded in familiar and unfamiliar contexts
… (2002) with the aim to teach words to grey parrots. I adapted this teaching technique to operationalize a controlled comparison between children’s word learning success in dyadic and triadic teaching situations. This method was guided by similar studies conducted by Pepperberg and Sherman …
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La patria perdida o imaginada: translating teodoro torres in "el mexico de afuera"
… The Adventures of Don Chipote: Or, When Parrots Breast-Feed (1928) and Conrado Espinoza's Under the Texas Sun (1926), which likewise document the experiences of Mexicans who fled north to the United States in order to escape the chaos created by the Mexican Revolution. However, unlike Don …
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Avian Diversification in the Andes: Understanding Endemism Patterns and Historical Biogeography
The Andes, along with the Amazon and Atlantic forests, harbor the richest avifauna in the world with roughly one third of all the world's species of birds. Many biogeographical studies have sought to explain the origin and diversification of Andean taxa. However, because of the Andes' extensive …
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Die Bedeutung der Paarbindung für das Fortpflanzungspotential von Papageienvögeln (Psittaciformes) : vergleichende Untersuchung zu Hormonstatus und Verhalten
Zum Erhalt vom Aussterben bedrohter Papageienvögel (Psittaciformes) ist die Nachzucht in Menschenobhut neben dem Erhalt freilebender Populationen von großer Bedeutung, die Reproduktion bestimmter Arten gelingt allerdings nur unzureichend. Als Hauptgrund dafür gilt die Zwangsverpaarung im Rahmen von …