From Halopedia, the Halo wiki
The Fall of Reach
Prior to the glassing of Reach in 2552, Mr. Brantley had received a shipment of moa from the planet. With the native moa population having been brought close to extinction during the Fall of Reach, Brantley's latest population of moa instantly became worth more than their weight in titanium, turning him into a wealthy man. Brantley's zoo is now home to the largest single population of remaining moa in the galaxy.