It was akin to trying to distinguish a fish crow
from an American crow on a moonless night.
Species susceptibility has been shown to differ within various avian families (7), including birds in the family Corvidae, of which, for example, the fish crow
(Corvus ossifragus) was less susceptible to lethal WNV infection (23).
The agency has also gunned down the brown-headed cowbird, boat-tailed grackle, common raven, American crow, fish crow
and waterfowl and wading birds that relish the coastal wetlands neighboring Kennedy, such as the wood duck, bufflehead, American wigeon, semipalmated plover, sanderling, least sandpiper, black-crowned night heron, great egret and cattle egret, according to Port Authority records.
They observed 84 species on count day and four additional species - lesser scaup, peregrine falcon, fish crow
and common yellowthroat - during count week.
a fearsome great horned owl refuses to get in a flap as a cheeky fish crow
swoops to nab its supper.
Three other crows claim American territory: The slightly smaller fish crow
In 1998, the CSS went a step further by placing wood shipping pallets on the roof to provide the chicks cover from their natural predator, the fish crow
Infections also have been reported in the red-tailed hawk, fish crow
, house sparrow, American robin, merlin, song sparrow, Canada goose, great blue heron, northern mockingbird, eastern bluebird, cockatiel, mute swan, and yellow-rumped warbler.
VecTest of feather pulp for 43 RT-PCR-positive corvids (37 American Crows, 5 Blue Jays, 1 Fish Crow
) identified WNV in 36 (84%) of the birds tested.
By this standard, the vaccine performed reasonably well, with no vaccinated fish crow
having a recorded viremia [greater than or equal to] [10.sup.4.7].
American Crows also became infected after consuming a WNV-infected House Sparrow carcass (83% susceptibility, n=6); three Black-billed Magpies and a Fish Crow
did not become infected after consuming infected House Sparrows or infected mice.
Infectious WNV particles were detected in all but one specimen, a cloacal swab taken from a Fish Crow
. Viral titrations and quantitative TaqMan RT-PCR indicated that the concentrations of WNV averaged >[10.sup.5] in all three specimen types (Table).