Duck Gumbo

4 large ducks, cut up
4 tablespoons flour
2 tablespoons oil
1/2 cup (1 stick) butter
2 cups fresh okra, cut up
1 large onion, chopped
1 large green bell pepper, chopped
3 cloves garlic, minced
3 tablespoons scallions, chopped
1 tablespoon Worcestershire sauce
3 quarts water
Gumbo fil