Turkey Vulture (Cathartes aura) 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 of […]
Category: Falconiformes
OLFACTORY SENSITIVITY OF THE TURKEY VULTURE (CATHARTES AURA) TO THREE CARRION-ASSOCIATED ODORANTS
Turkey Vulture (Cathartes aura) Science Article 2 abstract The Turkey Vulture (Cathartes aura) is generally thought to rely on olfactory cues to locate carrion. Because vertically rising odorants are dispersed rapidly by wind turbulence, we predict that Turkey Vultures should be highly sensitive to these chemicals to detect them at foraging altitudes. Olfactory thresholds to […]
Seed dispersal of Attalea phalerata (Palmae) by Crested caracaras (Caracaraplancus) in the Pantanal and a review of frugivory by raptors
Southern Crested Caracara (Caracara plancus) Science Article 1 abstract We observed Crested caracaras (Caracara plancus) consuming and dispersing fruits of the palm Attaleaphalerata at Pantanal, Brazil. We reviewed the literature of seed dispersal by raptors and suggest that raptors may affectseed dispersal by three different paths: secondary seed dispersal by preying on frugivorous birds, primary […]
Photos of Micrastur species in Peru, covering the Surinam species
Slaty-backed Forest Falcon (Micrastur mirandollei) Science Article 1 abstract Five of the seven species of the mysterious Forest-falcons (Micrastur: Falconidae) occur en Los Amigos river basin, Madre de Dios, Peru Ursula Valdez, Boletin SAO Vol. XVI (No. 02) – Dic. 2006 Download article download full text (pdf)
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 […]
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 […]
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 […]
Correlates of hunting range size in breeding merlins
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 […]