The screeching runner-type of dinosaur is answered by several other animal calls. Probably the most significant is a pair of, well... ...yes, those are two Tyrannosaurs, and at their feet, a small herd of raptors.

The Tyrannosaurs are much more likely to attract attention than the flurry of barks that follow, but since they don't seem to be advancing, the source of the barking is fairly easy to distinguish.

Ammy darts around her flock, scolding Will'o'Wisp's ambushers at length. You get down from there right now young male!