This evening (July 19) from about 8:10 to 8:25,
under a flaming-orange sunset sky, 140 fish crows
gathered in the trees at the intersection of
route 123 (Chain Bridge Rd) and Hunter Mill Road
before heading south, probably to roost for the
night. Does anyone know where they are roosting?
There were no common crows evident. Do they
roost separately? Has anyone else noted a
dramatic decline in local american crows? If so,
is this decline statewide?
These following links discuss the impact of west
nile virus on crow populations in North America.
http://www.bioone.org/bioone/?request=get-document&issn=0010-5422&volume=107&issue=01&page=0128
and
http://chicagowildernessmag.org/issues/winter2004/crows.html
and
http://www.birdsource.org/gbbc/eBirdWNVDeclines.html
and
http://web.aurora.edu/~djhorn/evolution/westnilevirus.htm
I wonder if fish crows are less susceptible to
West Nile virus and if their population is
increasing to fill the void of the American crow.
All the best
Fred
Frederick D. Atwood fredatwood@xxxxxxxxx
Flint Hill School, 10409 Academic Dr, Oakton, VA 22124
703-242-1675
http://www.agpix.com/fredatwood
http://www.flinthill.org
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