Imperial Eagle (Aquila heliaca) Science Article 1 abstract Seit langerer Zeit widmen wir uns dem Studium der Greifvogel in der Ostslowakei. Dabei konnten wir in dreizehn aufeinanderfolgenden Beobachtungsjahren u.a. 65 Bruten des Schreiadlers und 28 des Kaiseradlers kontrollieren. Fur beide Arten liegen uber Gelegegro

Hook-billed Kite (Chondrohierax uncinatus) Science Article 1 abstract The Hook-billed Kite (Chondrohieraxu ncinatus),a neotropical, snail-eating raptor, exhibits extraordinary intraspecific variation in bill size, which is unrelated to sex and age and is largely independent of geographic origin. Bill size varies much more than overall body size and is bimodally distributed in many parts of the […]

Harpy Eagle (Harpia harpyja) Science Article 1 abstract I recorded a Harpy Eagle (Harpia harpyja) while conducting an environmental impact assessment with the Instituto de Historia Natural de Chiapas, Mexico, for construction of the highway from Sayula, Veracruz to Ocozocoautla, Chiapas. My sighting was made on 12 March 1991 about 17:00 h, at the Reserva […]

Harpy Eagle (Harpia harpyja) Science Article 3 abstract A male and female Harpy Eagle (Harpia harpyja), both reintroduced captive-bred subadults,were observed on Barro Colorado Island (BCI), Panama for 89 and 205 days, respectively, between June 1999 and August 2000. The male captured 25 individuals from nine different mammalian species and the female captured 46 individuals […]

Harpy Eagle (Harpia harpyja) Science Article 2 abstract One of the most interesting results of an expedition to northeastern Brazil, taken by the writer in conjunctionw ith Mr. Rodolphe M. de Schauenseed uring the late winter and spring of 1926, was the discovery of a nest of the Harpy Eagle (Thrasaetush arpyia), about three miles […]

Griffon (Gyps fulvus) Science Article 1 abstract Morning and evening counts undertaken in Griffon Vulture Gyps fulvus colonies and communal roosts revealed that their numbers fluctuated by season and time of the day. In the colonies the vultures built up high numbers during the pre-breeding and incubation periods (November-February) with maxima in December-January and dropped […]

Griffon (Gyps fulvus) Science Article 2 abstract To apply modern habitat modelling techniques using generalized linear models approach to generate not only explicative but also predictive habitat suitability models. Ecological factors that could affect the species? nesting habitat preferences at two spatial scales, one referred to the colony as a sampling unit and another trying […]

Grey-headed Kite (Leptodon cayanensis) Science Article 1 abstract The Gray-headed Kite (Leptodon cayanensis), a little-known Neotropical raptor (Blake 1977, Brown and Amadon 1989, de1 Hoyo et al. 1994); occurs in lowland tropical forests from central-eastern Mexico to northern Argentina (Brown and Amadon 1989). Only one nest and two clutches of the species have been described […]

Grey Hawk (Buteo nitidus) Science Article 1 abstract On 23 April 1876, near Fort Bayard, Grant County, New Mexico, Frank Stephens collected two sets of eggs that he identified as those of the Gray Hawk (Buteo nitidus). Through the years this identification has been accepted without question, but my recent study of the matter suggests […]

Greater Spotted Eagle (Aquila clanga) Science Article 4 abstract There is anecdotal evidence that this species’s small population is declining, at a rate likely to exceed 10% in three generations, which qualifies it as Vulnerable. It has suffered from extensive habitat loss and persistent persecution. Edited by NJ Collar, AV Andreev, S Chan, MJ Crosby, […]