Illustration of Phorusrhacos prehistoric birds attacking a Doedicurus clavicaudatus prehistoric armadillo. Phorusrhacos is an extinct flightless predatory bird that lived during the Miocene epoch (around 23 to 5 million years ago) in what is now South America. It grew up to 2.5 metres tall. Doedicurus is an extinct herbivorous glyptodont mammal that lived from around 2 million to 11,000 years ago. It reached up to 4 metres in length.