Interesting bit of information. I seem to recall that it's said that one way to separate Chihuahuan from Common Raven in Arizona / New Mexico is that only Chihuahuans occur in flocks. Maybe that is true in that area, but could this cast some doubt on that?
I didn't think about it all that much a few weeks ago when hawk watching near Port Jervis, NY, but at one point a group of 9 or 10 Common Ravens flew by. A couple of years ago, upon coming back from this trip, I reported on up to 40 apparently going to a roost near the pull off south of the Bear Mountain Bridge. No sign of that on this year's trip (although up to 50 Black Vultures likely going to a roost closer to the bridge made for an impressive sight). Steve Walter -- NYSbirds-L List Info: http://www.NortheastBirding.com/NYSbirdsWELCOME.htm http://www.NortheastBirding.com/NYSbirdsRULES.htm http://www.NortheastBirding.com/NYSbirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://email@example.com/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L 3) http://birding.aba.org/maillist/NY01 Please submit your observations to eBird: http://ebird.org/content/ebird/ --