You know how that "Red-shouldered Hawk" you hear screaming usually turns out 
to be a Blue Jay instead? And how that "raven" calling is of course merely 
an American Crow giving one of its hoarser cries?

I've been hearing raven-like noises in the vicinity for some weeks now, and 
telling myself the source of the sounds is obviously just a crow. Well, 
maybe it is. But this afternoon, I observed two crows fly by in a big 
hurry -- chasing a raven.

Presumably it's one of the Cabin John birds; I live less than five miles 
from there as the corvid flies.

Janet Millenson
Potomac, MD (Montgomery County)

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"Look at the birds!" -- Pascal the parrot