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 15 of 15 for “"falcons"”.
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Behavioural ecology of Peregrine and Lanner falcons in South Africa
… species (subgenus Hierofalco, the desert falcons). Peregrine density and productivity tend to decrease with latitude, while desert falcons may be most successful in the tropics. This study compares the biology of Peregrines and sympatric Lanner Falcons F. biarmicus in South Africa, and …
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No universal support for solar glare as an evolutionary driver of malar stripes in falcons
The paired dark malar or moustachial stripes of falcons (Falco spp.) are putatively adaptive plumage features whose function and evolutionary significance are poorly understood, and have rarely been investigated in published literature. A popular hypothesis for the function of falcon malar stripes …
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Current Status of Falcon Populations in Saudi Arabia
<p>Falcons (Falco spp.) are widely used for falconry in the countries of the Middle East. During the 2015 breeding season, we surveyed historic and active nest sites of Barbary (Falco pelegrinoides pelegrinoides) and Lanner (F. biarmicus) Falcons in Saudi Arabia. Field and questionnaire surveys …
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The Trash Birder's Guide
… Essays include the search for peregrine falcons and ‘u’aus, navigating “The Biggest Week in American Birding,” and tending to owls and geese at a bird sanctuary. In addition, the essays seek to use the langue and images of birding to create an interconnected narrative that not only …
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Sociable weaver nests as a resource to local animal communities
… skinks (Trachylepis spilogaster), African pygmy falcons (Polihierax semitorquatus) and snakes. These species have all been shown to associate with weaver colonies and may impact weavers and each other in different ways. I show that Sociable weaver colonies create localised biodiversity hot-spots. …
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Birds and Humans in the Old Norse World, c. 600-1500 AD
… birds, wild waterfowl and songbirds, hawks and falcons, eagles, ravens, and swans. These case studies analyse literary sources, documentary sources, and archaeological reports to build a multifaceted look at these birds and how they were understood, interacted with, and thought about. In many …
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A Multi-Scale analysis of organochlorine pesticide contamination in raptor populations: research effort, historical trends, and current concentrations
… were sampled from multiple migratory Amur Falcons (Falco amurensis), collected during a mass mortality event at two roost sites in the KwaZulu-Natal Province of South Africa. The analysis of these migratory falcons was only the second study conducted in a country of the Global South, …
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American Kestrels (Falco sparverius) may use tail-pumping to maintain balance
<p>When perched, several species of small falcons, including American Kestrels (Falco sparverius), often pump their tails, but the possible function of this behavior is unknown. My objective was to use observations and experiments to examine the possible function(s) of tail-pumping by American …
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The ecology of the Manx shearwater Puffinus Puffinus on Rhum, West Scotland
… location within Rhum. Golden eagles, peregrine falcons and great black-backed guils do prey upon shearwaters on Rhum but have an insignificant effect upon the shearwater population. Hatching success in the colony varies markedly from year to year and is significantly negatively correlated with …
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Moult as a dynamic link in the annual cycle of birds: insights from seabirds and a long-distance migratory raptor
… and primary coverts in 100 non-moulting Amur Falcons. There are seven chapters including an introductory first chapter. In Chapter 1, I introduce the importance of feathers and why maintaining their quality is key to birds' survival. Feathers are dead structures once formed, and have to be …
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Biologically inspired composite image sensor for deep field target tracking
… aspects of the visual systems found in both falcons and primates, a composite multi-camera sensor was constructed. The sensor provides for expandable visual range, excellent depth of field, and produces a single compact output image based on the log-polar retinal-cortical mapping that occurs …
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Vocalizations Of Adult American Kestrels (falco Sparverius): Effect Of Breeding Stage, Sex, And Context On Call Use And Characteristics
<p>American Kestrels (Falco sparverius) are small falcons with a vocal repertoire known to consist of three different vocalizations: whine, chitter, and klee calls. However, the characteristics and contextual use of these calls have not been quantified. To determine the characteristics of these …
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Raptor Use of the Idaho National Engineering Laboratory
… hawks, ferruginous haws, gold eagles, prairie falcons, and great horned owls. Most raptors were perched on power poles when I observed them. Sit facilities did not appear to affect wintering raptor distribution. A high occurrence of raptors within 10 km of site facilities was probably a result …
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Shorebirds in a changing landscape: Assessing the top-down and bottom-up drivers of American oystercatcher (<i>Haematopus palliatus</i>) reproductive success in the Virginia barrier islands
… predators, including raptors (e.g., peregrine falcons [Falco peregrinus] and great horned owls [Bubo virginianus]) and Atlantic ghost crabs (Ocypode quadrata). Remotely sensed data provided an opportunity to investigate factors for which we lacked data collected in situ. Using aerial …