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Question on flocks of scavengers

Does anyone know whether the numbers of turkey vultures and black vultures
that feed on carcasses are members of a social-grouping, or are they just
solitaries that come together?  How about ravens that do the same thing?
The pair of Cloverly Formation Deinonychids around the iquanodonid may have 
been feeding at the same carcass, but may not have been in a social grouping.