The Te Anau Wildlife Centre is a small free-entry DoC-run facility, mostly housing rehabilitated birds I gather, although there are also takahe there.
There is some more info here about takahe at Te Anau:
http://www.doc.govt.nz/about-doc/news/media-releases/te-anau-takahe-health-check/
If you look very closely (with a magnifying glass!) there is a pair of takahe in this photo, above the D in Difference on the right-most sign, at the base of the big flax bush.
2 November 2012