Phorusrhacidae, commonly known as terror birds, were a family of large, flightless birds that lived in South America from the late Paleocene to the Miocene epochs. They were characterized by their long legs, large beaks, and powerful bodies, which made them effective predators. Some species could reach heights of over 3 meters (10 feet). These birds were part of a unique ecosystem and filled ecological roles similar to those of modern-day ostriches and raptors. Their extinction is believed to be linked to climate changes and competition with mammals, particularly as large mammals began to dominate the landscape.