“I never could have imagined that my career would involve sitting beside sloths and snakes on a late-night TV couch.’ “Jungle” Jack Hanna writes about the baby hippo he brought to his first appearance on Dave’s show, the camels that took out all the ceiling panels, the hyena that drank from Dave’s mug, the armadillos that mated on his desk, and the beaver that bit him on set. (includes video clips)