I was intrigued that the radar from the Wilmington site showed the concentration appearing along the area of Hoover Dam at about 8 am. This lasted only briefly until it moved north and spread out. After some reflection, it occurred to me that it must have been due to geese and/or other waterfowl which had been resting overnight on the lake and taking off for daytime feeding grounds. Rich Richard Cressman Columbus OH [log in to unmask] ______________________________________________________________________ Ohio-birds mailing list, a service of the Ohio Ornithological Society. Our thanks to Miami University for hosting this mailing list. Additional discussions can be found in our forums, at www.ohiobirds.org/forum/. You can join or leave the list, or change your options, at: http://listserv.muohio.edu/scripts/wa.exe?LIST=OHIO-BIRDS Send questions or comments about the list to: [log in to unmask]