The ADU no longer exists and the webpage has been removed from the UCT official website.
However, you will find the old ADU webpage in the WayBack Machine of the Internet Archive at the following URL: https://web.archive.org/web/*/adu.org.za.
If you are looking for the former ADU projects, these are now managed by the The FitzPatrick Institute of African Ornithology.
Discontinued projects: BIRP & My Bird Patch.
Other former ADU websites still available: