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American crows were captured by using cannon net traps in Bellvue, Colorado, USA; the National Wildlife Diseases Program, Animal and Plant Health Inspection Service, United States Department of Agriculture, assisted with the captures.
One of the principal factors limiting plover recovery is egg and chick predation (USFWS 2007), especially by Common Ravens (Corvus corax) and to a lesser degree American Crows (C.
American Crows are known to herd sparrows into the sides of buildings where the stunned sparrows become easy prey.
He then watched his test subjects--first a pair of American crows, and later five common--ravens attempt to bring home the bacon (in this case, it was actually salami).
Species hardest hit appear to be blue jays, American crows, black-billed magpies, tufted tit-mice, and black-capped and Carolina chickadees.
When compared to previous GBBC counts, the data documented regional declines in the population of American crows that may be related to the West Nile virus.
Two wildlife biologists equipped with binoculars, clipboards and tally "clickers" search the urban skyline for the first flights of American crows making their way to a stand of trees nestled on a hillside in downtown Troy.
Among birds, American crows (Corvus brachyrhynchos) and European starlings (Sturnus vulgaris) seem particularly susceptible to infection by West Nile virus, based on reported cases of mortality.
Nearly 90% of the 4,304 West Nile-infected birds in 2000 were American crows, which are highly susceptible to the virus and develop high levels of viremia, followed by blue jays (5%).
Increasing reports of WNV infections in American crows, other avian species, and mosquitoes are being accompanied by reports of neurologic disease caused by WNV in humans, horses, and other mammals.
American crows (Corvus brachyrhynchos) are acutely sensitive to West Nile virus (WNV) infection, and crow mortality has been used in WNV surveillance to monitor enzootic transmission.
Notably, the NS3 Thr249Pro substitution, suggested to be associated with increased virulence for American crows (15), was not uniformly present in all the 2008-2009 isolates in Italy.

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