Merlin (Falco columbarius) Science Article 1 abstract I studied variables affecting size of hunting range in breeding Merlins (Falco columbarius) from May to July, 1987-l 990 in Saskatoon, Canada. Males were monitored during most of the breeding season, whereas females were observed only in the fledging period when they hunt. During the incubation period, the […]
Category: Falconiformes
Observations on Migratory Turkey Vultures and Lesser Yellow-headed Vultures in Northern Colombia
Lesser Yellow-headed Vulture (Cathartes burrovianus) Science Article 1 abstract Turkey Vultures (Cathartes aura) breed from southern Canada to Tierra del Fuego, while Lesser Yellowheaded Vultures (Cathartes burrovianus) occur from M xico through Central America to northern Argentina and Uruguay (Meyer de Schauensee 1966).It has long been known that Turkey Vultures breeding in the northern parts […]
SEX DETERMINATION OF LESSER KESTREL (Falco naumanni ) BY PCRRFLP FROM FEATHER SAMPLES
Lesser Kestrel (Falco naumanni) Science Article 1 abstract The Lesser Kestrel (Falco naumanni) is a small colonial migratory falcon, mostly insectivorous (grasshoppers and locusts), that breeds in South Italy between March and September. Populations have decreased by 90% since the middle of the 20th century in Europe Costantini V., Guaricci et al, S.I.R.A., 2007 Download […]
International Action Plan for the Lanner Falcon Falco biarmicus
Lanner Falcon (Falco biarmicus) Science Article 2 abstract The Lanner Falcon is classified as Endangered at the European level and is categorised as SPEC 3(Tucker & Heath 1994). It is also listed in Annex I of the European Union’s Wild Birds Directive,Appendix II of the Bonn Convention, Annex II of the Bern Convention, and Appendix […]
Behaviour of female Eurasian Kestrels during laying: are there time constraints on incubation?
Kestrel (Falco tinnunculus) Science Article 1 abstract To investigate time, energy, and temperature constraints on hatching asynchrony in Eurasian Kestrels (Falco tinnunculus), we observed females during the laying period and quantified the time spent hunting to see whether this might limir time spent incubating. We predicted that females would hunt more in years when the […]
Variation in the quality of parental care at falcon nests in South Africa as evidence for postulated differences in food availabi lity.
Lanner Falcon (Falco biarmicus) 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 […]
Breeding biology and nest characteristics of the Eurasian Kestrel in different environments on an Atlantic island
Kestrel (Falco tinnunculus) Science Article 9 abstract We studied reproductive parameters, nest-site characteristics and breeding success of theEurasian Kestrel (Falco tinnunculus canariensis) on Tenerife Island, Canary Archipelago.Kestrels typically breed in cliffs cavities (79.4%), and were present in all habitatsfrom sea level to 2,400 m, except in shrubby heaths (rich in Myrica faya and Ericaarborea) and […]
Intermittent Gliding in the Hunting Flight of the Kestrel, Falco Tinnunculus
Kestrel (Falco tinnunculus) Science Article 6 abstract The hunting flight of the kestrel (Falco tinnunculus) consists of short bouts of flight at wind speed against the wind with the eyes in a fixed position relative to the ground, and of short flights from one such position to the next. High speed films taken with a […]
Sex and testosterone effects on growth, immunity and melanin coloration of nestling Eurasian kestrels
Kestrel (Falco tinnunculus) Science Article 10 abstract Sex differences in testosterone levels and sex-biased sensitivity to testosterone are the basis of some ideas postulated to account for sex-linked environmental vulnerability during early life. However, sex variation in circulating testosterone levels has been scarcely explored and never manipulated at post-natal stages of birds in the wild. […]
Inter-sexual differences in the immune response of Eurasian kestrel nestlings under food shortage
Kestrel (Falco tinnunculus) Science Article 2 abstract When resources are limited, parents should decide the optimal number, size, and sex of progeny, and offspring should decide the optimal allocation of resources to different costly functions, such as growth and immunity. We manipulated clutch sizes of Eurasian kestrels by one egg to estimate possible cumulative effects […]