Possible Clues:

• Ability to resist sickness on boat
• In the main people find them a steadying influence
• Eagles fly South and sailors soon get them
• Good standing with sailors?
• In the main, they provide support
• Marine mammals, perhaps captured -- one hopefully has them on board
• Sailor's balance
• With these, one can surely walk on water
• Close up examples of adapted balance
• Balance for one second on large animal