On the below Link is a 17 min interview with Rex. At the link scroll down till you see the below text. It is mainly on the Moa in New Zealand and their research. It uses Windows media player..
Feature Interview: Rex Gilroy
Self-taught naturalist seeking proof that extinct animals like the Moa and Tasmanian Tiger are still around. (duration: 17′44″)
http://www.radionz.co.nz/national/programmes/ninetonoon/20080125>