Pack Hunters. The terror birds live and hunt in packs of ten to twelve individuals. They are clever hunters, drawing their prey into positions that allow the birds to flank. Their attacks are done with blazing speed and ferocity, removing limbs in a flurry of lacerating bites.

Fortress Nests. Terror birds live in woods or copses of trees, where they assemble walls made of branches around large nests. The nests have several ways in and out, and creatures without the terror bird's long legs find navigating the nests difficult. Several adults stay behind to guard the eggs and nest while the rest go out hunting.

Mounts for Plains Tribes. Tribes of dust goblins, hobgoblins, humans, and even gnolls have been known to capture terror birds for use as mounts in battle.