Rapture Zoo
From BioShock Wiki
The Rapture Zoo was a level that was intended to be included in BioShock. Multiple interviews with developers of the game mention that this was a level that was ultimately cut fairly far along in the design process due to time constraints, and they indicate that it was one of the things they most regretted having to cut. To date, no known art assets from the Zoo level have surfaced so virtually nothing is known about it. The only concrete information comes from an interview that mentions that it would have included an elephant.
