Robert Pattinson and Sean Penn are circling Fox 2000's Depression-era drama "
Water for Elephants."
Based on Sara Gruen's best-selling historical tome of the same name, story centers on a Cornell U. veterinary student who leaves his studies after his parents are killed and joins up with the Benzini Brothers Most Spectacular Show on Earth, working as a vet for the circus. Witherspoon will play Marlena, the beautiful equestrian star married to August (Penn), the charismatic but twisted animal trainer.