4 winters of NG tucson

I have lived with NG inTucson for 4 winters, starting in 2000-01. In 2007-08, I had 44 daily-sightings of NG during my 6 month (minus 9 days in Washington state) visit. During those 6 months I observed 5 sets of doubles! 2 of the sets were females, and 2 sets were male and female. 1 set was not sexed or aged, since I was chasing the birds and trying to work with camera in order to get photographs. All the photographs were taken by me, except for the 1 photo by Bert Jackson, and I was witness to that photographing. In winter, NG in Tucson, and just out side of city limits are a common species, and are "readily available for observation". Please note: I am referring to raptors in flight, not perched raptors.