USAToday Lions and tigers and bears! (Cue the 'Oh my!') Those are real animals, not CGI, in Robert Pattinson's new circus flick Water for Elephants, co-starring Reese Witherspoon (it's out April 22). But with all those carnivores prowling around the 1930s-themed set, you'll never believe which animal Pattinson feared most.  The horses.Scarier than having to throw meat into a lion's cage? "I had t…