Siberian Jay (Perisoreus infaustus) Science Article 2 abstract This thesis examines risk management in breeding Siberian jays (Perisoreusinfaustus), which is indigenous to the northern taiga. Parent behaviour and the nestare cryptic. A new nest is built each year. It is placed on spruce or pine branches closeto the trunk and well insulated with lichens, feathers […]

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 […]

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. […]

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 […]

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 […]

Magpie (Pica pica) Science Article 4 abstract The breeding of some birds, such as raptors or owls that do not build theirown nest, is often limited by the availability of nests constructed by otherbird species. When breeding habitats substantially lack natural nest sites(e.g., cavities in trees or cli s), a strong conflict over the nest […]

Magpie (Pica pica) Science Article 6 abstract Rearing full siblings under different environmental conditions allows partitioning of the totalphenotypic variance of a trait into its genetic and environmental components. This, in naturalbird populations, is usually achieved by cross-fostering experimental designs. We estimatedgenetic and environmental components Liesbeth De Neve et al, Evolutionary Ecology Research, 2004, 6: […]

Magpie (Pica pica) Science Article 1 abstract Laying date is one of the most important determinants of reproductive success and recruitment probability in birds. Late breeders usually fledge fewer chicks than individuals with earlier breeding dates, and fledglings produced late in the season have high mortality rates. Food availability and nestling mass have been evoked […]

Magpie (Pica pica) Science Article 10 abstract European magpies (Pica pica) from southern France were tested for antibodies to West Nile virus (WNV) and viral shedding in feces during spring

Magpie (Pica pica) Science Article 11 abstract In many animals immunity is not fully developed until adulthood but the youngstill need protection against various sets of pathogens. Thus, bird nestlings are highlydependent on antibodies received from their mother (in the eggs) during their rapidearly growth period. MARJO PIHLAJA, HELI SIITARI and RAUNO V. ALATALO, Journal […]