Could some of the extinct terror birds been able to hunt in packs?

With their resonating champber in their beaks, they could send out signals to other members of the group on how and where to attack their prey.

Some othe the group could lie in wait while some of the group chase the prey towards them, making reasurring clacks of the beaks, and then ambush them at once.

And some skull analysis shows that these birds may have been capable to to some strategic hunting, planning their hunts and probably do some problem solving, meaning they were intellegent birds.

sorry but no-one knows the answer to your question.