West Nile virus devastated the crow population in the Washington, DC, area--in the mid-Atlantic generally, I think--and it is only within the last three years o

West Nile virus devastated the crow population in the Washington, DC, area--in the mid-Atlantic generally, I think--and it is only within the last three years or so that they have started to come back. The figures of about a thousand crows roosting together are nothing to what one used to see 25 years ago.