Category: Worldwide oriental region

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 […]

Predator avoidance behaviour of a solitary Willet attacked by a Peregrine Falcon

Peregrine Falcon (Falco peregrinus) Science Article 13 abstract During the non-breeding season, Willets Catoptrophorussemipalmatusu se a variety of tacticst o avoid predatorsa ndhave beenr eportedt o take flight, submergeth emselvesinwater, and hide in or near marsh vegetation JOSEPH B. BUCHANAN, Bulletin 104 August 2004 Download article download full text (pdf)

The Distribution and Conservation Status of the Gull-billed Tern ( Gelochelidon nilotica ) in North America

Gull-billed Tern (Gelochelidon nilotica) Science Article 2 abstract The Gull-billed Tern (Gelochelidon nilotica) has until recently received little conservation and managementattention within North America despite a relatively low overall population size and significant declines inparts of the breeding range. This lack of attention may stem in part from the wide distribution of the species, encompassingparts […]

Fledgling sex ratio variation in colonies of Gull-billed Tern Gelochelidon nilotica

Gull-billed Tern (Gelochelidon nilotica) Science Article 1 abstract Fisher (1930) predicted that natural selectionshould favour equal parental investmentin male and female offspring, and that populationsex ratios at the end of the period ofparental care should be inversely related to thecost of producing individuals of each sex if fitnessreturns from investment in sons and daughtersare similar. […]

Moonlight’s influence on predator/prey interactions between short-eared owls (Asio tlammeus) and deermice (Peromyscus maniculatus)

Short-eared Owl (Asio flammeus) Science Article 1 abstract This study examines the effect of moonlight intensity on deermouse (Peromyscus maniculatus) vulnerability to predation by short-eared owls (Asio flammeus). Three nocturnal light intensities, labeled new moon, quarter moon, and full moon, were simulated in a flight chamber. Deermouse activity was observed and measured by an index […]

Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia

Roseate Tern (Sterna dougallii) Science Article 2 abstract Breeding seabirds are threatened by human activities that affect nesting and foraging habitat.In Canada, one of the seabirds most at risk of extirpation is the Roseate Tern, Sterna dougallii. Althoughcritical nesting habitat has been identified for the Roseate Tern in Canada, its foraging locations and thediet of […]

Activity patterns and effect of ticks on growth and survival of tropical roseate tern nestlings

Roseate Tern (Sterna dougallii) Science Article 1 abstract Patterns of abundance of the seabird tick Amblyomma loculosum and their effectson Roseate Tern (Sterna dougallii) nestling growth, fledging age, and survival are describedon Aride Island, Seychelles, in 1997-1999. Female ticks attached to nestlings from 4to 14 days (to engorge) whereas male ticks attached for 1-3 days. […]