Two duck like birds that I often see in S.W. Florida are the Common Gallinule and Mottled Duck.
The Common Gallinule shown in the picture above also known as the Common Moorhen has a dark body, and red bill and often swims in ponds, lakes, streams and other wetland bodies, feeding upon seeds of grasses and sometimes snails. It is able to walk on top of aquatic vegetation or mud flats with its long toes. It is also an excellent swimmerand will dip its head in the water looking for food. The Common Gallinule makes a loud screeching call and sound and can be reproduced on the All About Birds website. It is listed on the threatened list of birds in America because of predation by other animals and loss of habitat.
The Mottled Duck is distinguished by its multi-colored feathers on its body, green bluish colors on its tail, lighter colored neck and head and yellow bill. Its picture is also shown above. Like the Common Gallinule, it also makes its habitat in fresh water marshes, ponds, lakes and estuaries. It feeds upon the seeds of grasses, aquatic vegetation, small fish and marine invertebrates. The Mottled Duck is in danger of becoming extinct because of its breeding with the similar Mallard Duck which produces a hybrid version of the Mottled Duck. It is also hunted throughout the United States for sport. You can learn more about the Mottled Duck and Common Gallinule on the All About Birds or Florida Audubon websites.