Aardvarks at Melbourne Zoo, from the ever-trusty Zoochat files:
Posted by tetrapod in 2009: "Melbourne Zoo kept some aardvarks in the late '70s. They were kept in the old pens (since been knocked down) where one would have found wombats, echidnas and prairie dogs. Probably where the new elephant housing is."
http://www.zoochat.com/2/aardvarks-16403/index2.html
Posted by ZooPro in 2007: "The last prairie dog and aardvark died at Melbourne Zoo in the late 80s."
Followed by: "....she lived in an off limits area of the zoo for the last few years of her life. She died in 1981, and I think the male died in the late 70s."
http://www.zoochat.com/24/when-did-die-out-7388/
(I'm not sure if that last one contains a typo where "late 80s" should read "early 80s", or if "1981" should read something later like "1987" or something)