Last update: 2004.
This is the single most complete guide to exhibit-building in the original Zoo Tycoon (2001). SWCarter's walkthrough on GameFAQs comes close, but is missing all of the Complete Collection bonus animals. While the wiki provides some of the raw data for animals, Pixigger offers in-depth information on the animals, and the thing I consider most valuable in a guide that most wikis don't offer: advice. Pixigger has tables for determining the best bang-for-your-buck when it comes to fences, foliage, and rocks for your exhibits. This is crucial if you want to play campaigns without relying on the money cheat.