Longevity Record for the Northwestern Crow, with a Comparison to Other Corvids

1997 ◽  
Vol 78 (3) ◽  
pp. 111 ◽  
Author(s):  
Fred C. Zwickel ◽  
Nicolaas A. M. Verbeek
Keyword(s):  
Northwestern Crow

Mobbing Behaviour, Nest Exposure, and Breeding Success in the American Robin

Behaviour ◽  
1986 ◽  
Vol 96 (1-2) ◽  
pp. 171-185 ◽  
Author(s):  
Ian G. Mclean ◽  
K. Glenna Stewart ◽  
James N.M. Smith
Keyword(s):  
Reproductive Success ◽  
Nest Site ◽  
Costs And Benefits ◽  
Potential Cost ◽  
American Robin ◽  
Experimental Procedure ◽  
American Robins ◽  
Northwestern Crow ◽  
Extreme Responses ◽  
Mobbing Behaviour

AbstractWe tested some costs and benefits associated with variable levels of mobbing response towards nest predators by American robins. Playbacks of robin mobbing calls attracted a major predator of robin nests, the northwestern crow. This demonstrates a potential cost to robins that give mobbing calls. We then used human 'predators' to test whether reproductive success was related to mobbing intensity. We first showed that mobbing responses to humans resembled those shown to a stuffed crow. Second, we demonstrated that responses of pairs of robins were consistent at different tests at the same nest, but were less consistent between different nesting attempts of the same pair. The first result validates our experimental procedure, but the second result suggests that variation in mobbing response is partly determined by characteristics of the nest or nest site, rather than by the level of aggressiveness of the parents. When we compared mobbing responses by robins at exposed and well-concealed nests, robins with exposed nests used extreme responses (swoops and hits) more frequently than those with concealed nests. We did not, however, find an consistent relationship between mobbing intensity, stage of the nestling cycle, or reproductive success. Robins did not respond more strongly late in the nesting cycle, and pairs that responded weakly, or strongly, experienced similar levels of nesting success.

Northwestern Crow (Corvus caurinus)

1999 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

COOPERATIVE BREEDING OF THE NORTHWESTERN CROW CORVUS CAURINUS IN BRITISH COLUMBIA

Ibis ◽  
2008 ◽  
Vol 123 (2) ◽  
pp. 183-189 ◽  
Author(s):  
Nicolaas A. M. Verbeek ◽  
Robert W. Butler
Keyword(s):  
British Columbia ◽  
Cooperative Breeding ◽  
Corvus Caurinus ◽  
Northwestern Crow

Natal pterylosis of the northwestern crow, Corvus caurinus

1991 ◽  
Vol 69 (6) ◽  
pp. 1534-1537 ◽  
Author(s):  
Nicolaas A. M. Verbeek
Keyword(s):  
British Columbia ◽  
The Body ◽  
Strait Of Georgia ◽  
Corvus Caurinus ◽  
Northwestern Crow

The number of natal down feathers (neossoptiles) and their arrangement in specific feather tracts of the body (pterylosis) are given for 19 nestlings of the northwestern crow, Corvus caurinus, from the Strait of Georgia, British Columbia. The natal pterylosis of the northwestern crow is compared with that of other members of the genus Corvus in the Nearctic and Palearctic regions. This comparison points out several differences in the capital, abdominal, and caudal tracts within the genus.

scholarly journals Poecivirus is present in individuals with beak deformities in seven species of North American birds

2020 ◽  
Author(s):  
Maxine Zylberberg ◽  
Caroline Van Hemert ◽  
Colleen M. Handel ◽  
Rachel M. Liu ◽  
Joseph L. DeRisi
Keyword(s):  
Sanger Sequencing ◽  
Population Level ◽  
Disease Status ◽  
Causal Link ◽  
Avian Species ◽  
Unknown Etiology ◽  
Metagenomic Sequencing ◽  
Coding Region ◽  
Bird Populations ◽  
Northwestern Crow

ABSTRACTAvian keratin disorder (AKD), a disease characterized by debilitating beak overgrowth but with unknown etiology, has increasingly affected wild bird populations since the 1990s. We previously showed that a novel picornavirus, Poecivirus, is closely correlated with disease status in Black-capped Chickadees (Poecile atricapillus) in Alaska. However, our knowledge of the relationship between Poecivirus and beak deformities in other species and other geographic areas remains limited. The growing geographic scope and number of species affected by AKD-like beak deformities require a better understanding of the causative agent to evaluate the population-level impacts of this epizootic. Here, we tested eight individuals from six avian species with AKD-consistent deformities for the presence of Poecivirus: Mew Gull (Larus canus), Hairy Woodpecker (Picoides villosus), Black-billed Magpie (Pica hudsonia), Northwestern Crow (Corvus caurinus), Red-breasted Nuthatch (Sitta canadensis), and Blackpoll Warbler (Setophaga striata); individuals were sampled in Alaska and Maine (1999-2016). We used targeted PCR followed by Sanger sequencing to test for the presence of Poecivirus in each specimen, and to obtain viral genome sequence from virus-positive host individuals. We detected Poecivirus in all individuals tested, but not in negative controls. Furthermore, we used unbiased metagenomic sequencing to test for the presence of other pathogens in six of these specimens (Hairy Woodpecker, two Northwestern Crows, two Red-breasted Nuthatches, Blackpoll Warbler). This analysis yielded additional viral sequence from several specimens, including the complete coding region of Poecivirus from one Red-breasted Nuthatch, which we confirmed via targeted PCR followed by Sanger sequencing. This study demonstrates that Poecivirus is present in individuals with AKD-consistent deformities from six avian species other than Black-capped Chickadee. While further investigation will be required to explore whether there exists a causal link between this virus and AKD, this study demonstrates that Poecivirus is not geographically restricted to Alaska, but rather occurs elsewhere in North America.

Northwestern Crow (Corvus caurinus)

2020 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

Clam storage in a Northwestern Crow (Corvus caurinus): dispersion and sequencing

1985 ◽  
Vol 63 (4) ◽  
pp. 857-860 ◽  
Author(s):  
Paul C. James ◽  
Nicolaas A. M. Verbeek
Keyword(s):  
Experimental Study ◽  
British Columbia ◽  
Nearest Neighbour ◽  
Recovery Sequence ◽  
Neighbour Distance ◽  
Corvus Caurinus ◽  
Northwestern Crow ◽  
Very High ◽  
Sequence Position ◽  
Made In

An experimental study of clam storage by a Northwestern Crow (Corvus caurinus) was carried out on Mitlenatch Island, British Columbia, Canada. The crow was trained to take clams from a feeding table. His dispersion of the clams was studied using nearest-neighbour distance (NND). The distance clams were carried and the sequence of storage and recovery was also quantified. Median NND was significantly correlated with storage sequence position, as was NND with distance carried. The crow tended to recover the clams in the same order as he stored them, as storage sequence position was significantly correlated with recovery sequence position. The results were compared with other spatiotemporal studies of avian food hoarding. Recovery success of the crow was very high, he appeared to use memory to relocate his caches, as the majority of them were made in new sites, and he never revisited those already emptied.

Northwestern Crow (Corvus caurinus)

1999 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

The Food Storage Behaviour of the Northwestern Crow

Behaviour ◽  
1983 ◽  
Vol 85 (3-4) ◽  
pp. 276-290 ◽  
Author(s):  
Paul C. James ◽  
Nicolaas A.M. Verbeek
Keyword(s):  
Food Storage ◽  
Northwestern Crow
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