New Zealand

The largest species of eagle that has ever existed is an extinct Haast’s eagle, endemic to New Zealand.

An excerpt from the article 35 facts about New Zealand
It weighed 15 kilograms and became extinct in 1400. Its main prey were Moa–species of extinct flightless birds that could reach the weight of 230 kilograms.

The extinction of both Haast’s eagle and nine Moa species was a direct result of the Polynesian people’s arrival in New Zealand between 1250 and 1300 CE.