Sunday, in Ferrisburg, at one of my CLO (Cornell Lab. Ornith.) sites, I
heard a familiar call that I wasn't able to name.  I tried to check it
out, without luck, though there were sounds from two immatures added in
to the adult call.  Some minutes later I turned to see an adult
accipiter fly into the area the sounds had come from.  Size of a female
sharpie or male Cooper"s, but  the call had not been a sharpie.  At
home I checked the vocalizations and yes, they were Cooper"s.