Harold is a squirrel living a happy if sheltered life in his park on New York City's Upper West Side. But when a streetwise rat persuades him to take part in an experiment, Harold suddenly finds himself without his tail fur-and without a home. Mistaken for a rat and forced out on the unfamiliar streets of New York, Harold encounters a cast of unforgettable characters, including a neurotic pigeon, a vain cat, and a tribe of hostile squirrels. But it's...