Nature: Deinornis australis (Terrible Bird of the South)

Deinornis australis. Its name means "terrible bird of the South". It is a fictional hybrid between Gastornis and Phorusrhacos, a flightless bird, and hunter of medium mammals.  Its main characteristics are strong legs ending in sharp claws, a strong and sharp beak, small vestigial wings.  You would not want to find yourself facing this formidable predator, you would end up being his lunch.