Aiwhas were flying cetacean creatures that lived on Kamino and Nabooboo. How'd they get from one planet to the other? They flew. The gigantic airborne whales tended to show up most frequently when Twitter was down, hence their nickname "fail whales."
The odds of such a creature evolving naturally were eight million seven hundred and sixty-seven thousand one hundred and twenty-eight to one against. They have been transmogrified into their current form by an improbability drive. Blame Arthur Dent.