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RE: DINOSAUR BEHAVIOR
Social hunting in existing animals actually comprises many behaviors
which are more or less coordinated, as Darren's post points out.
The modern view of field biologists is that many supposed "cooperative"
hunters are not actually taking very sophisticated roles, they are just
all going for the same prey. The "cooperation" part mainly means that
they do not attack each other. The storybook notion that one pack
member lies in ambush while others drive prey toward it has been refuted
in most (but not all) mammalian carnivores.
Social insects show that highly coordinated behavior can occur in
creatures without much in the way of intellegence.
There is no reason to rule out cooperative or social hunting in
dinosaurs, and indeed there are several strong pieces of evidence in
favor of it.