Short-toed Snake Eagle (Circaetus gallicus) Science Article 1 abstract […].The aim of this study was to provide information on the visible autumn migration of Shorttoed Eagles at these two sites of the Central Mediterranean through systematic observations made during the second half of September 2001. […]. Agostini, N., Baghino, L., Panuccio, M. & Premuda, G., […]
Seasonal and interannual variability in laying date, clutch size, egg volume and hatching asynchrony of four lark species in Mediterranean Spain
Short-toed Lark (Calandrella brachydactyla) Science Article 2 abstract To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrella rufescens) and at two different time scales: between years (large-scale variation), and within […]
Parental body mass changes during the nestingstage in two Lark species in a semi-arid habitat
Short-toed Lark (Calandrella brachydactyla) Science Article 1 abstract Parental body mass changes during the nesting period were analysed for Thekla Larks,Galerida theklae, and Lesser Short-toed Larks, Calandrella rufescens. Body mass of femaleThekla Larks declines from the start of incubation until the chicks fledge; laying date,interpreted as the number of renesting attempts, also has a negative […]
THE SHORT-TAILED NIGHTHAWK IS A TREE NESTER
Short-tailed Nighthawk (Lurocalis semitorquatus) Science Article 1 abstract A nest of the Short-tailedN ighthawk, Lurocalis semitorquatus noctivagus, was found in Panama.It was located on a 15-cm diameter, horizontal branch in an Erythrinafusca tree,6 m above ground. The tree was growing on the side of a pond in semi-open habitat, closeto old second-growth, lowland forest. The […]
A feeding record of the Short-tailed Hawk Buteo brachyurus in itssouthern range
Short-tailed Hawk (Buteo brachyurus) Science Article 1 abstract The Short-tailed Hawk Buteo brachyurus occurs from south USA through Central America, and south to northern Argentina and Chile (Thiollay 1994). This species is found to be uncommon, although widespread in large areas of South America (Robinson 1994, Manosa et al. 2003, Blendinger et al. 2004). Buteo […]
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 […]
Phylogenetic analysis of life-history adaptationsin parasitic cowbirds
Shiny Cowbird (Molothrus bonariensis) Science Article 2 abstract Parasitic cowbirds lay eggs in the nests of other species and dupe them into caring for their young. Unlike other brood parasites,cowbirds have not developed egg mimicry or bizarre chick morphology. However, most of them parasitize a large number ofhosts. Several features of cowbirds have been proposed […]
Conirostrum bicolor Parasitized by Molothrus bonariensis in Surinam
Shiny Cowbird (Molothrus bonariensis) Science Article 3 abstract Hellmayr (Field Mus. Nat. Hist. Publ. 347, Zoo1. Set. vol 13, 1935, p. 319) includes Surinam in the range of Conirostrum bicolor on evidence of the Penard brothers (Vogels van Guyana, 2, 1910, p. 475), though he mentions no specimens nor localities. In Surinam, as elsewhere in […]
Feeding associations between capybaras Hydrochoerus hydrochaeris (Linnaeus) (Mammalia, Hydrochaeridae) and birds in the Lami Biological Reserve, Porto Alegre, Rio Grande do Sul, Brazil.
Shiny Cowbird (Molothrus bonariensis) Science Article 7 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 […]
Parasitism by Shiny Cowbirds of Rufous-Bellied Thrushes
Shiny Cowbird (Molothrus bonariensis) Science Article 1 abstract I studied the interaction between a brood parasite, the Shiny Cowbird (Molothrusbonariensis), and a large host, the Rufous-bellied Thrush (Turdus rujventris), in the Pampas Region of Argentina. Shiny Cowbird eggs were observed in 34 out of 70 (48.6%) thrush nests throughout the host’s breeding season. The main […]