Tag: Raven

Rock climbing and Raven Corvus corax ocurrence depress breeding success of cliff-nesting Peregrines Falco peregrinus

Raven (Corvus corax) Science Article 3 abstract Aims: To assess the significance of rock climbing-induced disturbance and Raven Corvus corax occurrence on the breeding output of a cliff-nesting Peregrine Falco peregrinus population.Location: Northern Italy- southern Switzerland.Methods: Breeding success, productivity and fledgling rate of 29 Peregrine pairs were analysed in relation to the occurrence of rock […]

Effect of raven Corvus coraxscavenging on the kill rates of wolf Canis lupuspacks.

Raven (Corvus corax) Science Article 4 abstract During late winter 1991 and 1992, we investigated the influence of raven Corvus coraxscavenging on the predation rate by different-sized wolf Canis lupuspacks on moose Alces alcesin the Yukon Territory, Canada. To assess the magnitude of scavenging, we presented 10 ungulate carcasses, pre-warmed to simulate the flesh temperature […]

Effect of prior nesting success on future nest occupation in raven Corvus corax

Raven (Corvus corax) Science Article 6 abstract Based on the fate of 48 nests of Raven Corvus corax we tested the hypothesis that low return rates of Raven were caused by unsuccessful nesting attempts in previous seasons. Ravens nested on electrical power pylons in 1996-1998 in an intensively managed farmland (W Poland). The studied nesting […]

Proximity of raven (Corvus corax) nest modifies breeding bird community in an intensively used farmland

Raven (Corvus corax) Science Article 1 abstract In this paper I tested the hypothesis that areas around nests of raven Corvus corax built on electricity pylons in an intensively used farmland are avoided by small birds as their nest sites. Birds were counted along 13 transects (length 1000 m, width 200 m) starting from pylons […]

Behavioural phenotypes may determine whether social context facilitates or delays novel object exploration in ravens ( Corvus corax )

Raven (Corvus corax) Science Article 7 abstract Individuals consistently differ in behavioural phenotypes. Here we examine the interaction between behavioural phenotype and response to social context during novel object exploration in a neophobic corvid species, the raven (Corvus corax). The presence of conspecifics tends to encourage object exploration and learning but may also delay or […]

Interactive behaviour between Bearded Vultures Gyp tus barbatus and Common Ravens Corvus corax in the nesting sites: predation risk and kleptoparasitism

Raven (Corvus corax) Science Article 2 abstract Aims: Aggressive interactions between the Bearded Vulture Gyp tus barbatus and the Common Raven Corvus corax are frequent in the Pyrenean nesting sectors shared by both species. The Bearded Vulture’s nesting sectors are vulnerable to kleptoparasitism (food is stored in a visible and predictable manner in nests, perching […]

Evidence for cryptic northern refugiaamong high- and temperate-latitude species in Beringia

Raven (Corvus corax) Science Article 9 abstract Stewart and Dalen (2008) argue that only temperate species were locked incryptic northern refugia during Pleistocene glacial cycles, while species presently found athigh latitudes had much wider distributions during glaciations. Christin L. Pruett & Kevin Winker, Climatic Change, 2007 Download article download full text (pdf)