Assateague Island, Virginia
The ponies of Assateague Island have captured the imagination of generations, particularly after Marguerite Henry wrote about Misty of Chincoteague. They are survivors. They are horses, but look like ponies because their saltwater marsh food supply has low nutritional value. And while nobody knows for sure how they ended up on the island, one theory suggests they swam to shore from shipwrecks off the coast in the 1600s.