Possible Clues:

• Order including whales and dolphins
• Order including whales
• A pair of aces, possibly, held model in Wales, you may say
• Order of whales, etc
• Fixed continent, as some might say, for certain mammals
• Dolphins' order
• Presumably, they have a whale of a time with accountant hiding alien expert
• Order of whales
• Order of marine mammals that includes whales and porpoises
• Dolphins' biological order