This morning at 8AM I passed the first of my four prothonotary nest boxes 
above Riley's Lock on the C&O canal.  Two tree swallows were perched close by, so 
I assumed the fight was over.

An hour later, on my way back, there was a male prothonotary perched right on 
top of the box singing strongly for a mate.

This weekend I will try to install another box close by to accommodate both 
species.

Bob Mumford
Darnestown