They could create an aesthetically-pleasing exhibit that can satisfy the needs of the diverse collection of species rather simple; by creating an actual forrest! The Gibbons have their trees for climbing and brachiating, the Tigers can hide themselves in the dense forrest floor and the herbivores can forage between the trees. I know this will be difficult to achieve, but think of how amazing that must be! Then the act of surprise would really come to life. The signage could be simply placed upon viewing the first of the exhibits and should explain the rotation exhibit idea.