The most formidable birds of the Cenozoic have usually been on islands, like Madagascar’s elephant birds or New Zealand’s moa, where they faced less competition from mammals. The Phorusrhacids ...

These large, carnivorous, flightless birds, known scientifically as Phorusrhacidae, were among South America’s top predators during the Cenozoic Era. Standing between 3 and 6.6 feet tall and ...