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Phorusrhacids, commonly known as “terror birds” because of their role as apex predators, were large, carnivorous, flightless birds that roamed S America during the Cenozoic era, from about 62 million to 2 million years ago. They are believed to have migrated to N America when the Isthmus of Panama formed, bridging the formerly separated continents. The birds ranged in height from about 3 to 10 ft (1 to 3 m) and were likely fast runners. What are thought to be their closest modern-day relatives? Discuss
Source: The Free Dictionary