Rose-breasted Grosbeak (Pheucticus ludovicianus) Science Article 1 abstract On September 4, 1904, a boy brought to me an adult female Rose-breasted Grosbeak (Zamelodialudoviciana), the bill of which presented a curious realformation. Careful examination shows that the condition was not caused by injury, as there is no trace whatever of a fracture, and the upper mandible […]
Category: Passeriformes
Biometrics and sex identification of the Rose-Coloured Starling Sturnus roseus
Rose-coloured Starling (Pastor roseus) Science Article 1 abstract Biometric and plumage data on breeding Rose-coloured Starlings Sturnus roseus showed that the species is partially sexually dimorphic in size and plumage colour. Both sexes develop a brood patch, although it is most frequently found in females. Although males are generally more intensely coloured than females, there […]
Male Rock Sparrow (Petronia petronia) Nest Defence Correlates with Female Ornament Size
Rock Sparrow (Petronia petronia) Science Article 1 abstract We investigated the relationship between male nest defence and female breastpatch size in an alpine population of rock sparrow (Petronia petronia)in northernItaly. We presented a mounted weasel Matteo Griggio et al, Ethology 109, 659-669 (2003) Download article download full text (pdf)
Neergang en herstel van de Roek als broedvogel in Nederland in de 20e eeuw
Rook (Corvus frugilegus) Science Article 1 abstract Jarenlange vervolging en een daaruit volgende afname brachtende broedpopulatie van de Roek vijftig jaar geleden op een dieptepunt.Verminderd gebruik van gifstoffen en een wettelijke beschermingleidden in de jaren zeventig van de vorige eeuw inveel voormalige broedgebieden een spectaculair herstel in.Inmiddels lijkt de populatiegroei te stagneren. Tegelijk neemt hetaantal […]
Investigating Physical Cognitionin Rooks, Corvus frugilegus
Rook (Corvus frugilegus) Science Article 3 abstract Although animals (particularly tool-users) are capable of solving physical tasks in the laboratory, the degree to which they understand them in terms of their underlying physical forces is a matter of contention. Here, using a new paradigm, the two-trap tube task, we report the performance of non-tool-using rooks. […]
Non-tool-using rooks, Corvus frugilegus, solve the trap-tube problem
Rook (Corvus frugilegus) Science Article 4 abstract The trap-tube problem is used to assess whether an individual is able to foresee the outcome of its actions. To solve the task, an animal must use a tool to push a piece of food out of a tube, which has a trap along its length. An animal […]
Habitat preferences of foraging Rooks Corvus frugilegus during the breeding period in the agricultural landscape of eastern Poland
Rook (Corvus frugilegus) Science Article 2 abstract The study was carried out in 2000-2002 around 6 rookeries. Rooks foraged in numbers from 1 to 132 birds (n = 417); flocks of less than 10 individuals were dominant. The type of crop influenced the size of a foraging flock. Most of the rooks were recorded within […]
Open-habitat birds in recently burned areas: the role of the fire extent and species’ habitat breadth
Rock Bunting (Emberiza cia) Science Article 1 abstract Single burned areas contained 0 to 15 open-habitat species (mean = 7.6), and in all the areas combined there were 22 species, including 17 with an unfavourable conservation status in Europe. The most frequent were Carduelis cannabina, Lullula arborea, Alectoris rufa, Oenanthe hispanica and Emberiza cia, but […]
REPORT ON A SURVEY OF RING OUZEL Turdus torquatus torquatus TERRITORIES IN ROSEDALE AND OTHER AREAS OF THE NORTH YORK MOORS IN 2008
Ring Ouzel (Turdus torquatus) Science Article 2 abstract The 2008 survey was the ninth year in which a detailed study had been made of the ring ouzel Turdus torquatus torquatus (RZ) population in the North York Moors National Park and continued the work started in 1999 (foot & mouth preventing work in 2001). The findings […]
Intraspecific variation in the wing shape of the long-distance migrant Reed Warbler Acrocephalus scirpaceus: effects of age and distance of migration
Reed-Warbler (Acrocephalus scirpaceus) Science Article 1 abstract The wing morphology of Reed Warblers Acrocephalus scirpaceus was studied during the breeding and non-breeding cycle in a western Mediterranean area. Wing morphology was first analysed by means of a principal component analysis (PCA) on primary lengths, which corrects for allometric effects on wing shape. Two-way ANOVAs were […]