Yuda

Yuda (遊蛇 (ユダ) Yuda, translated as Traveling Snake) are a ferocious and poisonous type of sea serpent. They live in the Calm Belt and are so dangerous that they are one of the few creatures that Sea Kings won't attack, but apparently the Kuja people were able to domesticate them.

Boa Hancock and her two sisters own a ship which is drawn by these creatures, a newly added method of navigating through the Calm Belt.

Trivia

 * Yuda are the second species that are fiercer than Sea Kings to be owned by a Shichibukai (Boa Hancock), the first being Bananawani owned by Crocodile. Both of them also represent their owner's reptilian animal themes, snakes and crocodiles respectively.