This is probably common knowledge, but tonight I was pleased to find a 
massive crow roost (both Fish and American) at the intersections of Loch 
Raven Blvd and The Alameda in Baltimore.  It's difficult to judge at 
night, but the roost appeared to contain 5000+ crows.  The most 
impressive thing about it was that nearly all birds were silent - even 
when flocks of hundreds were moving from tree to tree.

Cheers,
Steve Collins
Towson, MD