The Moa extinction occurred around 1300–1440 ±20 years, primarily due to overhunting by the Māori. Here's how big they were; human for scale : r/HumanForScale
File:Dinornis robustus scale diagram.png - Wikipedia
MOA vs MRAD: What is the Difference Between the Two? – XHunt Targets
Giant Moa Size Comparison by Bvega41 on DeviantArt