Teratornis was a genus of huge North American birds of prey – the best-known of the teratorns - of which, two species are known to have existed: Teratornis merriami and Teratornis woodburnensis.
Thought to have been extinct for 10,000 years, there are still some that remain alive on Primeval Island. In fact, they are one of the most birds on the island, alongside Archaeopteryx, Titanis, Dodo, Giant Moa, Hieraaetus, Iberomesornis, and Ichthyornis.