Peregrine Falcon (Falco peregrinus) Science Article 5 abstract Aims: To assess the significance of rock climbing-induced disturbance and Raven Corvus corax occurrence on the breeding output of a cliff-nesting Peregrine Falco peregrinus population.Location: Northern Italy- southern Switzerland.Methods: Breeding success, productivity and fledgling rate of 29 Peregrine pairs were analysed in relation to the occurrence of […]
Gliding flight: drag and torque of a hawk and a falcon with straight and turned heads, and a lower value for the parasite drag coefficient
Peregrine Falcon (Falco peregrinus) Science Article 6 abstract Raptors falcons, hawks and eagles in this study-such as peregrine falcons (Falco peregrinus) that attack distant prey from high-speed dives face a paradox. Anatomical and behavioral measurements show that raptors of many species must turn their heads approximately 40 deg to one side to see the prey […]
Population size and factors affecting the density of the Peregrine Falcon in Spain
Peregrine Falcon (Falco peregrinus) Science Article 3 abstract By means of bibliographical searches and requests of unpublished information from ornithologists and public administrations all over the country, the population size estimate of the Peregrine Falcon Falco peregrinus in Spain is updated. Spanish population is estimated at 2435-2743 pairs, which represents a mean density of 5.1 […]
Nest-site overlap and coexistence between Bonelli’s Eagle (Hiera tus fasciatus) and Peregrine Falcon (Falco peregrinus) in an area of simpatry.
Peregrine Falcon (Falco peregrinus) Science Article 2 abstract Nest-site selection has been compared between the populations of Bonellis Eagle (29 pairs) and Peregrine Falcon (35 pairs) in an area of simpatry in Southeastern Spain (Granada province). 18 variables evaluating habitat humanisation, physiography, intraspecific and interspecific distances and vegetation (Appendix 1) were compared between both species […]
Gliding flight: speed and acceleration of ideal falcons during diving and pull out
Peregrine Falcon (Falco peregrinus) Science Article 8 abstract Some falcons, such as peregrines (Falco peregrinus), attack their prey in the air at the end of high-speed dives and are thought to be the fastest of animals. Estimates of their top speed in a dive range up to 157ms?1, although speeds this high have never been […]
Limited geographic variation in the vocalizations ofa neotropical furnariid, synallaxis albescens
Pale-breasted Spinetail (Synallaxis albescens) Science Article 1 abstract I recorded and analyzed vocalizations of Synallaxis albescens from three populations in Venezuela,two continental and one island, to assess the extent of geographic variation for a species of the familyFumariidae. Previous work on geographic variation in suboscines has focused on species of the Tyrannidae. Ialso tested the […]
The Paint-billed Crake Breeding in Costa Rica
Paint-billed Crake (Neocrex erythrops) Science Article 1 abstract We report a recent observation from southern Costa Rica of the Paint-billed Crake (Neocrex erythrops), a little known species from eastern and northern South America. An adult and recently hatched chick were observed at close range in wet grassy second-growth. This observation constitutes the first record of […]
First United States Record of Paint-billed Crake (Neocrex erythrops)
Paint-billed Crake (Neocrex erythrops) Science Article 2 abstract On 17 February 1972 Donald Baker, then an undergraduate in the Department of Wildlife and FisheriesSciences, Texas A&M University, caught a small rail in one of his traps for furbearers, along astream south of College Station, Brazos County, in east-central Texas. The bird was brought to me […]
The feeding ecology and digestive tract morphometry of two sympatric tinamous of the high plateau of the bolivian andes
Ornate Tinamou (Nothoprocta ornata) Science Article 1 abstract We studied the trophic niche breadth and the degree of overlap in the winter diets of two sympatric species of tinamous in the Bolivian Andes, the Ornate Tinamou (Nothoprocta ornata) and the Darwin?s Nothura (Nothura darwinii), by analyzing crop and gizzard contents of birds collected by sport […]
Food consumption and roosting behaviour of Great Grey Shrikes Lanius excubitor wintering in south-western Finland.
Northern Shrike (Lanius excubitor) Science Article 10 abstract For diurnal predators the short time of winter daylight may limit the possibilities to feed and hunt. In this field study, these aspects, as well as roosting behaviour,were evaluated in wild Great Grey Shrikes (Lanius e. excubitor). The main roost-sites were large junipers (Juniperus communis) and willows […]