They lived during the Permian period

su tamaño podría haberles proporcionado una mayor eficiencia en la digestión y en la obtención de energía a partir de la dieta vegetal de la época

adapted for aquatic life

which lived in the late Cretaceous period

similar to today's African savannah

Kelenken Variant:Unprimed They lived during the PermianKelenken (K. guillermoi `Terror Bird) is a genus of phorusrhacidae, an extinct group of large predatory birds that lived in the Middle Miocene to Neogene Epoch, about 15 million years ago, in what is now Argentina. Phororracids were large flightless birds with long hindlimbs, narrow pelvises, proportionately small wingspans, and huge skulls with a hooked beak and are thought to have been dominant land predators or scavengers in the Cenozoic. Kelenken