A terror bird is a prehistoric predator native to South America. In the real life universe, it may have went extinct about 1.8 million years ago, though in Tribalverse-0001, natural selection was in their favor and they managed to survive to the present day. In real life, it was originally believed that they lived as late as 10,000 years ago, but there is no evidence for this.
Terror birds stood 1 - 3 meters high and are related to seriemas, falcons and parrots. Terror birds resemble ostriches in that they cannot fly, but instead can run at high speeds. Larger terror birds were extremely agile and could reach speeds up to 48 km/h or 30 mph.