In South Florida we have a lot of Muscovy ducks that are about as big as geese (though smaller than Canadian geese). They aren't in a hurry to get out of the way of cars, let alone bikes. Although the main critter obstacle I encounter on most bike paths down here are iguanas that are over 3 feet long. Unless you're biking the tram path at Shark Valley, alligators are the main speed bump there.