Designing in Zoo Tycoon 2 has been around since 2004, although few designers existed until 2006. Members at ZT Expanded discovered how to open and edit the game's files shortly after the game's release. This has lead to the creation of new animals, objects and others for Zoo Tycoon 2 for other fans to download. While Zoo Tycoon required an official software to create animals, designing for Zoo Tycoon 2 is solely user-supported. Most of Blue Fang, except for BFKeith, haven't said anything of user-made content. BFKeith has stated that he enjoyed seeing what the community comes up with.