The Haast's eagle (Harpagornis moorei) is an extinct species of eagle that once lived in the South Island of New Zealand, commonly accepted to be the Pouakai of Maori legend. The species was the largest eagle known to have existed. Its primary prey was suspected to consist of moa. This eagle's massive size may have been an evolutionary response to the size of its prey, as both would have been much smaller when they first came to the island, and would have grown larger over time due to lack of competition (see island gigantism). Haast's eagle became extinct around 1400, when its major food source, the moa, were hunted to extinction by Maori, and much of its dense-forest habitat was cleared by them.

Taxonomy

Haast's eagle was first described by Julius von Haast in 1871 from remains discovered by F. Fuller in a former marsh. Haast named the eagle Harpagornis moorei after George Henry Moore, the owner of the Glenmark Estate, where the bones of the bird had been found. The genus name is from the Greek "harpax", meaning "grappling hook", and "ornis", meaning "bird".