Pigs haven’t exactly evolved for an aquatic lifestyle, but apparently that doesn’t stop the pigs from Big Major Cay, aka Pig Beach or Pig Island, part of the Exuma Cays archipelago in the Bahamas. The island is uninhabited when it comes to humans, but wild pigs have taken over, and over time they became good swimmers.
According to Wikipedia, there are about 20 swimming pigs on the island, which they share with a few stray cats and goats (though there’s no word on how good the cats and goats are at swimming…).
There are many legends and theories surrounding the swimming pigs: “[They’re said] to have been dropped off on Big Major Cay by a group of sailors…The sailors, though, never returned; the pigs survived on excess food dumped from passing ships. One other legend has it that the pigs were survivors of a shipwreck and managed to swim to shore, while another claims that the pigs had escaped from a nearby islet.”