Cedar Waxwing (Bombycilla cedrorum) Science Article 4 abstract We present the first observation of Cedar Waxwing (Bombycilla cedrorum) in theColombian Caribbean region, near Los Colorados National Park, in themunicipality of San Juan Nepomuceno, in the department of Bolivar. Cesar Buelvas Meza et al., Boletin SAO Vol. XVI (No. 01) – Jul. 2006 Download article download […]
Recent Breeding Range Expansion of the CedarWaxwing in South-Central North Carolina:Additional Information
Cedar Waxwing (Bombycilla cedrorum) Science Article 5 abstract Lee and Hendrickson (1998) documented the breeding range expansion of the Cedar Waxwing (Bombycilla cedrorum) to the southeast Piedmont, Sandhills, and Coastal Plain of North Carolina in the 1980s and 1990s. Douglas B. McNair, Tall Timbers Research Station, Florida Download article download full text (pdf)
NATURALLY OCCURRING SECONDARY NUTRITIONAL HYPERPARATHYROIDISM IN CATTLE EGRETS (BUBULCUS IBIS) FROM CENTRAL TEXAS
Cattle Egret (Bubulcus ibis) Science Article 4 abstract Naturally occurring secondary nutritional hyperparathyroidism is described in the nestlings of two colonies of cattle egrets (Bubulcus ibis) from Central Texas (Bryan and San Antonio, Texas, USA). Nestlings from a third colony (Waco, Texas, USA) were collected in a subsequent year for comparison. Birds from the first […]
Factors Affecting Chick Provisioning by Caspian TernsNesting in the Columbia River Estuary
Caspian Tern (Sterna caspia) Science Article 1 abstract We investigated factors affecting chick provisioning by radio-tagged Caspian Terns (Sterna caspia)nesting in a large colony on East Sand Island in the Columbia River estuary during 2001. Caspian Tern predationon juvenile salmonids (Oncorhynchusspp.) in the estuary prompted resource managers to relocate ca. 9,000 pairs ofterns nesting on […]
PACIFIC COAST CASPIAN TERNS: DYNAMICSOF AN EXPANDING POPULATION
Caspian Tern (Sterna caspia) Science Article 2 abstract Nesting distribution, age-related seasonal movements, survivorship, and mechanisms of population expansion in Pacific Coast Caspian Terns (Sterna caspia) were examined primarily through analysis of 412 recoveries of birds banded as juveniles between 1935 and 1980. Since the beginning of this century, the population has shifted from nesting […]
Foraging Patterns of Caspian Terns and Double-crested Cormorants inthe Columbia River Estuary
Caspian Tern (Sterna caspia) Science Article 3 abstract We examined spatial and temporal foraging patterns of Caspian terns and double-crested cormorants nesting in the ColumbiaRiver estuary, to potentially identify circumstances where juvenile salmonids listed under the U.S. Endangered Species Act mightbe more vulnerable to predation by these avian piscivores. Data were collected during the 1998 […]
Habitat selection of Hooded and Carrion Crows in the alpine hybrid zone
Carrion Crow (Corvus corone corone) Science Article 3 abstract Habitat selection of co-existing Hooded Crows Corvus corone cornix and Carrion Crows C. c. corone was studied in the Susa valley, an alpine valley in the Iitalian hybrid zone. Foraging habitat use by the two races was not significantly different during the autumn-winter whereas it was […]
Does year-round territoriality rather than habitat saturation explain delayed natal dispersal and cooperative breeding in the carrion crow?
Carrion Crow (Corvus corone corone) Science Article 4 abstract The ecological factors that promote delayed dispersal of offspring in cooperatively breeding bird species are poorly understood. While single population studies have supported the view that natal dispersal is delayed as a consequence of lack of suitable breeding vacancies (ecological constraints hypothesis), recent theoretical models claim […]
Kleptoparasitism by Peregrine Falcons on Carrion Crows
Carrion Crow (Corvus corone corone) Science Article 1 abstract […]. The study area was Bizkaia, a small province of 2300 km2 located in the north of Spain. In this area we have monitored about 35-38 Peregrine territories since 1997. During this time we have studied the prey of Peregrines in the nests, recording 931 prey […]
Reproductive success increases with group size in cooperativecarrion crows, Corvus corone corone
Carrion Crow (Corvus corone corone) Science Article 5 abstract The effect of group size and the number of helpers on reproductive success is crucial to understand theevolution and maintenance of cooperative breeding. In northern Spain, carrion crows form kin-groups(three to nine individuals) where up to five individuals contribute to rearing the young DANIELA CANESTRARI et […]