I've been noticing the "Crow guano" in the parking lot at DHMC myself.

On Wednesday afternoon I walked from the DHMC East entrance 
across "Parking Lot 20," the large employee lot, back to my office in the 
Colburn Hill Building.  The pathway was coated with guano.  My wife, Betsy 
Maislen, reported walking through the crows before dawn the next morning, on 
the West side of the Medical Center building.

In the past, I've also noticed them roosting in the trees along 120, between 
the Colburn Hill Building, and Centerra (which is directly across 120).

Bill

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