A flock of some 1000 ravens, not associated with night roosts, was seen during the breeding season. Some were feeding on the ground while others soared in the air above them. It is suggested that the large soaring flock acted as information transfers for feeding conditions.
White, Clayton M. and Tanner-White, Merle
"Unusual social feeding and soaring by the Common Raven (Corvus corax),"
Great Basin Naturalist: Vol. 45
, Article 21.
Available at: http://scholarsarchive.byu.edu/gbn/vol45/iss1/21