Parrots: Probably became widely thought of from the story "Treasure Island", specifically from the character "Long John Silver". There is a deal of controversy on this subject as many people suspect that pirates were much too practical to deal with pets. A parrot permanently stationed on the shoulder of a pirate would regularly generate a mess. As well, a parrot might get in the way of work, or be consumed during hard times at sea. So it is highly unlikely that having a parrot, or any pet for that matter, was too popular with pirates... Maybe some pirates dealt with their pet's messes just like some people today?