This afternoon, I had time for a short walk at Black Hills RP in 
Montgomery.  Back in some mixed pine and deciduous trees a fairly large 
hawk flew over at tree level.  I did not get a great look at first but 
by size took it for a Red-shouldered.  I then started hearing in 
unfamiliar call(like a Pileated woodpecker crossed with a chicken) 
coming from the direction the hawk flew.  I tracked it down and got a 
pretty good look at an accipitor in juvenile plumage.  Also confirmed 
that the calls were indeed coming from this bird.  I knew it wasn't a 
Sharpie but did have a small hope for a Northern Goshawk(it seemed large 
and did have a bit of a white eyebrow).  However, when I got home and 
listened to Elliot and Lang, it matched the vocalization of a Cooper's Hawk.

In Sibley's Eastern Guide the voice description for all 3 Accipitors is 
followed by the phrase "... at nest site."  Was this an unusual 
occurrence? I find it a little confusing because 1) nesting Cooper's are 
unusual for Montgomery; 2) bird was in juvenile plumage, and 3) safe 
date is not until 5/20.

Thanks for any input.

Andy Martin
Gaithersburg
apmartin2comcast.net