In Zookeeper, James and his stunt-doubles take a pounding — pratfalls, bicycle spills, porcupine pokes. It’s a kid-friendly romantic comedy, a Night at the Museum at the zoo. With slapstick and sincerity, James buys into the idea that he’s a friend to animals, big and small, and that a guy with his limited prospects and his lineman-gone-to-seed physique has a shot — several shots — at a beauty like Leslie Bibb. And he sells that idea to us, too.