Animals..
Honestly, I hate the fact this movie is even being made, considering circuses are horrible cruel forms of entertainment (especially the Ringling Bros) and they'll surely be showcasing them in a positive light for the film. A part of me wishes they'd go the Noah route and use mostly CGI animals, but obvious wishful thinking. Rather not have the movie made unless it really fleshes out the cruelty under those tents, doubtful though.
Im saddened Hugh Jackman would want to be a part of this. Its selling this outdated, horrible form of entertainment as something that should be celebrated. Pity.