Key Aspects: Three cruise lines have placed restrictions on cruise ducks: Disney Cruise Line, Royal Caribbean, and Marella Cruises. Despite the restrictions, none of the three cruise lines has ducks on its official prohibited items list. Guests should respect the restrictions, or the activity could be banned outright, and more cruise lines might introduce restrictions. Cruise ducks have flown to stardom for many guests, and hiding and finding a feathered flock can be great fun on a cruise vacation. Quackers of all sizes, shapes, and colors might appear just about anywhere on a...