Category Archive: Falconidae

May 28 2013

The Mallard talked and his enemy the Falcon heard.

The wintry winds had already begun to whistle and the waves to rise when the Drake and his mate gathered their half-grown brood together on the shore of their far northern lake. “Wife,” said he, “it is now time to take the children southward, to the Warm Countries which they have never yet seen!” Very …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/the-mallard-talked-and-his-enemy-the-falcon-heard

Dec 31 2011

Variation in the quality of parental care at falcon nests in South Africa as evidence for postulated differences in food availabi lity.

Peregrine Falcon (Falco peregrinus) Science Article 1 abstract Parental care by Peregrine Falcons Falco peregrinus an d Lanner Falcons F. biarmicus during the nestling period was studied in two areas of South Africa. Comparisons were made between the quality of care administered to broods of Peregrine Falcons at nests in tropical (the Soutpansberg) an d …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-1

Dec 31 2011

Identification of natal locales of peregrine falcons (falco peregrinus) by trace-element analysis of feathers

Peregrine Falcon

Peregrine Falcon (Falco peregrinus) Science Article 12 abstract Samples of secondary remiges collected from nestling Peregrine Falcons (Falco peregrinus) in Alaska and western Greenland were analyzed for trace-element content using instrumental neutron-activation analysis. Concentrations of 14 trace elements were subjected to a series of multivariate discriminant function analyses to ascertain whether or not these concentrations …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-12

Dec 31 2011

Kleptoparasitism by Peregrine Falcons on Carrion Crows

Peregrine Falcon (Falco peregrinus) Science Article 4 abstract […]. The study area was Bizkaia, a small province of 2300 km2 located in the north of Spain. In this area we have monitored about 35-38 Peregrine territories since 1997. During this time we have studied the prey of Peregrines in the nests, recording 931 prey of …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-4

Dec 31 2011

Genetic relationships in the peregrine falcon (Falcoperegrinus) analysed by microsatellite DNA markers

Peregrine Falcon (Falco peregrinus) Science Article 10 abstract Microsatellite DNA markers were developed from a peregrine falcon (Falco peregrinus)and genetic relationships among peregrine falcons in southern Norway were analysedusing the markers. The genomic DNA library was screened for the presence of dinucleotidemicrosatellite repeats. Twelve loci revealed polymorphism through the initial analysis of24 unrelated peregrine falcons, …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-10

Dec 31 2011

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 …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-8

Dec 31 2011

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 …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-2

Dec 31 2011

Population size and factors affecting the density of the Peregrine Falcon in Spain

Peregrine Falcon

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 …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-3

Dec 31 2011

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 …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-6

Dec 31 2011

Rock climbing and Raven Corvus corax ocurrence depress breeding success of cliff-nesting Peregrines Falco peregrinus

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 …

Continue reading »

Permanent link to this article: http://www.planetofbirds.com/peregrine-falcon-article-5

Older posts «