Before West Nile Virus hit, there were an awful lot of crows in the Washington, DC, area. I saw a statement in the newspaper that a stand of trees at Rockville

Before West Nile Virus hit, there were an awful lot of crows in the Washington, DC, area. I saw a statement in the newspaper that a stand of trees at Rockville Pike and Randolph/Montrose Road was home to half a million crows. That seemed improbable on its face; but it you were on that stretch of Rockville Pike about dusk, and saw the stream of crows, it gained probability. But West Nile Virus more than decimated the crows, and that stand of trees is gone. The crows are making something of a comeback now, after maybe 15 years of invisibility.