Category: Falconiformes

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 […]

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 […]

Curved flight paths and sideways vision in peregrine falcons (Falco peregrinus)

Peregrine Falcon (Falco peregrinus) Science Article 7 abstract When diving at prey straight ahead from great distances at high speeds, a peregrine has a conflict between vision and rodynamics: it must turn its head approximately 40 deg to one side to see the prey with maximum visual acuity at the deep fovea of one eye, […]

Nest defence by Lapwings : observations on natural behaviour and an experiment.

Peregrine Falcon (Falco peregrinus) Science Article 6 abstract Lapwings Vanellus vanellus are ground-nesting waders and they protect their nests by aggressively attacking predators near their nests . We investigated the response of parents to natural predators and a dummy Hooded Crow Corvus [corone] cornix during the incubation period. First, we investigated whether the presumed value […]

Nesting records of the genus Daptrius (Falconidae) from the Brazilian Amazon, with the first documented nest of the Black Caracara.

Black Caracara (Daptrius ater) Science Article 1 abstract Nesting records of the genus Daptrius (Falconidae) from the Brazilian Amazon, with the first documented nest of the Black Caracara. Whittaker, A., Ararajuba 4:107-109, 1996 Download article download full text (pdf)

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 […]

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 […]

Nesting observations of the Yellow-Headed caracara in the cerrado region of Brazil

Yellow-headed Caracara (Milvago chimachima) Science Article 1 abstract Although the Yellow-headed Caracara (Milvago chimachima) is widely distributed, common birds in South America, little is known concerning their breeding biology. Bierregaard (in del Hoyo et al. 1994) conducted an excellent review of known data, but details are based on fragmented observations, are incomplete, and often inferential […]

Feeding associations between capybaras Hydrochoerus hydrochaeris (Linnaeus) (Mammalia, Hydrochaeridae) and birds in the Lami Biological Reserve, Porto Alegre, Rio Grande do Sul, Brazil.

Yellow-headed Caracara (Milvago chimachima) Science Article 2 abstract Feeding associations between capybaras Hydrochoerus hydrochaeris (Linnaeus, 1766) and some bird species were registered in the Lami Biological Reserve, southern Brazil, through observations in a set of transects established in the five major vegetation types of the study area: shrubby and herbaceous swamps, wet grasslands, sandy grasslands […]