That particular sub-species of dune mouse if found only in South Walton. I think there are six different sub-species, each found on a different beach. St Andrews has it's own, and Santa Rosa (county) has its own, too.
Kurt named most of the ones I've seen. I'll add:
ghost crabs, blue crabs, fiddler crabs, bald eagle, osprey, turkey vulture, black vulture, cottonmouth, black racer, ants, caterpillars, butterflies, dragonflies, moths, great blue heron, great white heron, kingfisher, catbird, green anole, six lined racerunner, broadheaded skink, mocking bird, dove, coots, merganzer ducks, fish, and plenty of others.