Extinct, giant eagle was a fearsome predator Before humans colonised New Zealand about 750 years ago, the largest inhabitants of the islands were birds unlike those anywhere else in the world. Giant, flightless birds known as moa were the main plant-eaters, feeding both on the ground and in the branches of trees. The role of predator, according to a study published in the Journal of Vertebrate Palaeontology, was filled by a giant, extinct raptor known as Haasts eagle (Harpagornis moorei).
Source: Society of Vertebrate Paleontology
Haast's Eagle (Harpagornis moorei), was a massive, now extinct eagle that once lived on the South Island of New Zealand. It is the largest eagle known to have existed. It is believed that the Mori called it Pouakai; the often-cited name Hokioi (or hakawai) refers to the aerial display of the New Zealand Snipe - specifically, the extinct South Island subspecies. Source