White-throated Dipper (Cinclus cinclus) Science Article 1 abstract The outer breast plumage temperature of Dippers Cinclus cinclus roosting beneath river bridges was measured using an infra red thermometer over the environmental temperature range -0.8 to +10.9 deg C. Plumage temperature was close to, and directly related to, the temperature of the birds’ surroundings, but significantly […]
ENERGY EXPENDITURE BY FREE-LIVING DIPPERS (CINCLUS CINCLUS) IN WINTER
White-throated Dipper (Cinclus cinclus) Science Article 3 abstract We measured daily energy expenditure (DEE) of free-living Dippers (Cinclus cinclus) during winter, using the doubly-labelled water (DLW) technique. DEE was estimated as 206 kJd-1 by this method, compared to 194 kJd-l using time-activity budgets combined with laboratory estimates of metabolic costs D. M. BRYANT et al, […]
Male whitethroats, Sylvia communis, advertisetheir future contribution to parental care
Whitethroat (Sylvia communis) Science Article 1 abstract In altricial species participation of males in parental care enhances reproductive success offemales. How does a female select amate who will allocate time and energy to parental effort?In the whitethroat Sylvia communis, a socially monogamous bird, parental performance ofmales might be predicted on the basis of elaborated song […]
Do Common Whitethroats (Sylvia communis) discriminateagainst alien eggs?
Whitethroat (Sylvia communis) Science Article 2 abstract In a coevolutionary arms race between a brood parasite and its host, both species are expected to evolve adaptations and counteradaptations, such as egg mimicry and egg discrimination. The Common Whitethroat (Syh, ia communis) is a regular Common Cuckoo (Cuculus canorus) host in some parts of its breeding […]
PREY OF THE WHITE-TAILED KITE IN CENTRAL CHILE AND ITS RELATION TO THE HUNTING HABITAT
White-tailed Kite (Elanus leucurus) Science Article 3 abstract Between November 1973 and January 1974 we collected 702 pellets of Whitetailed Kites (Elanus lecurus) in two areas of central Chile differing in their vegetation physiognomy (disturbed versus undisturbed). We compared the diversity, age structure, and mean prey size of items found in pelletsf rom both simmTs.h […]
Food partitioning between breeding White-tailed Kites(Elanus leucurus; Aves; Accipitridae) and Barn Owls(Tyto alba; Aves; Tytonidae) in southern Brazil
White-tailed Kite (Elanus leucurus) Science Article 1 abstract I examined the diet of breeding White-tailed Kites (Elanus leucurus; Aves; Accipitridae) and Barn Owls (Tyto alba; Aves; Tytonidae) in an agrarian area of southern Brazil by analyzing regurgitated prey remains. The objective was to evaluate how these raptors, which differ markedly in their hunting activity periods […]
Elanus leucurus breeding in Surinam
White-tailed Kite (Elanus leucurus) Science Article 2 abstract The South American race of the White-tailed Kite (E. l. leucurus) according to Hellmayr and Conover (‘Catalogue of Birds of the Americas’. Field Mus. Nat. Hist., Zool. Set. 13, pt. 1, No. 4: 18, 1949) has been found definitely breeding only in Argentina and Chile. ‘The scattered […]
RAPTORS AND ‘CAMPO-CERRADO’ BIRD MIXED FLOCKLED BY Cypsnagra hirundinacea (Emberizidae:Thraupinae).
White-rumped Tanager (Cypsnagra hirundinacea) Science Article 1 abstract Bird mixed flocks including Cypsnagra hirundinacea and Neothraupis fasciata as species with sentinelswere studied in ‘campo-cerrado’ in order to investigate the possible relationship between alertnessand the mixed flock leadership. This study was conducted from March to September 1996 and mixedflocks were observed on average for 2:30h. The […]
Breeding Flight Display in the Female White-rumped Sandpiper
White-rumped Sandpiper (Calidris fuscicollis) Science Article 1 abstract Independent female aerial display or female participation in the aerial display of the male is virtually unreported. I present here my observations of an incident of female participation in the aerial flight display of the White-rumped Sandpiper (Calidris fuscicollis) at Barrow, Alaska. Brian J. McCaffery, Auk, volume […]
A Nest of the White-plumed Antbird (Pithys albifrons) in Surinam
White-plumed Antbird (Pithys albifrons) Science Article 1 abstract The White-plumed Antbird (Pithys albifrons) is one of the birds that follows army ants in the undergrowth of northern South American forests. In Surinam, breeding records involve only collected specimens of young birds (Hayerschmidt 1968, Birds of Surinam, edinburgh-London, England, Oliver and Boyd, p. 267). Nest and […]