Disney’s Zootopia is a witty and zippy family film, part police procedural, part fast-moving farce, that manages to bring up some weighty political and personal themes without getting bogged down in them. The premise is that mammals have evolved beyond their “animal” ways and have built a civilisation where predator and prey live side by side, although not in complete harmony. Judy Hopps (Ginnifer Goodwin) is a country rabbit with dreams of becoming a cop in the big city. Her parents, Bonnie (Bonnie Hunt) and Stu (Don Lake), are less than enthused by the idea, preferring Judy to stay in…