Peregrine Falcon (Falco peregrinus) Science Article 3 abstract By means of bibliographical searches and requests of unpublished information from ornithologists and public administrations all over the country, the population size estimate of the Peregrine Falcon Falco peregrinus in Spain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 […]
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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 […]
Aplomado falcon steals prey from little blue heron
Aplomado Falcon (Falco femoralis) Science Article 5 abstract A juvenile male Aplomado Falcon (Falcofemoralis) was observed to steal crayfish(Cambarus diogenes) from Little Blue Herons (Egretta caerulea). Crayfish are not known tobe a common prey item of the Aplomado Falcon. To our knowledge this is the first instanceof piracy reported for this falcon. Falcons of the […]
Double brooding by American kestrels in Idaho.
American Kestrel (Falco sparverius) Science Article 22 abstract No abstract Steenhof, K. and B.E. Peterson. 1997, J. Raptor Res. 31(3):274-297. Download article download full text (pdf)
Antibody-mediated immunotoxicity in American Kestrels (Falco sparverius) exposed to polychlorinated biphenyls.
American Kestrel (Falco sparverius) Science Article 23 abstract Antibody-mediated immune function in adult and recently fledged (30 to 33 d old) American kestrels (Falco sparverius) was examined in birds exposed directly, or only in ovo, to polychlorinated biphenyls (PCBs). In 1998, 9 mature male and 9 female kestrels were fed PCBs, whereas 9 females and […]
Saker Falcon (Falco cherrug) in Kyrgistan
Saker Falcon (Falco cherrug) Science Article 1 abstract Saker falcons occur throughout Kyrgistan territory both onmigration and during the breeding season. In autumn most passage birdsmigrate along the outer ranges of the mountains on the level of the middleparts of macroslopes and valleys of northern Tyan San and Issikuldepression. Spring migration goes along the same […]
Insects inhabiting Saker (Falco cherrug) nestsin Hungary
Saker Falcon (Falco cherrug) Science Article 2 abstract This study describes the species compositionof insects reared from larvalassemblages collected from Saker nests.Eight coleopteran and one dipteranspecies had been reared, none of whichappear to be specific to raptors’s nestsas a habitat. They are either characteristicto carcasses, or known to occur inmanure, or commensals living in a […]
International Action Planfor the Saker Falcon
Saker Falcon (Falco cherrug) Science Article 3 abstract The Saker Falco cherrug qualifies as Globally Endangered because it has undergone a very rapidpopulation decline, particularly on the central Asian breeding grounds, owing to inadequatelycontrolled capture for the falconry trade (BirdLife International 2006). It is also Endangered inEurope due to large declines and its very small […]
Saker Falcon (Falco cherrug) in Russia
Saker Falcon (Falco cherrug) Science Article 4 abstract The Saker (Falco cherrug) is one of the mostendangered falcon species in North Eurasia. In the pastthree decades its range and numbers have been declining atan alarming rate. The species is a typical representative ofarid zone ecosystems and in Russia it occurs at the extremesof its range.In […]
Paternity assurance in two species of colonially breedingfalcon: the kestrel Falco tinnunculus and the red-footedfalcon Falco vespertinus
Red-footed Falcon (Falco vespertinus) Science Article 1 abstract Mate-guarding and frequent within-pair copulations are the two main paternityguards of male birds. Some species of birds of prey depend on large foraging areas due tothe availability and dispersion of their food, and males supply their females with food frommating until early chick rearing. Furthermore, birds of […]