 The fulvous whistling duck has expanded its range in the West Indies , and into the southern US . A series of invasions from South America and reaching the eastern US commenced around 1948 , fueled by rice cultivation , and breeding was recorded in Cuba in 1964 , and Florida in 1965 . Some Florida birds still winter in Cuba . In Africa , it bred on the Cape Peninsula between 1940 and the 1960s . A survey of eighteen species which had colonised the area in recent decades found that most were wetland species that had used irrigated farmland as " stepping stones " across the arid country separating the peninsula from the breeding main range . However , the status of the two whistling duck species featured in the research is dubious since they are popular ornamental species , so their origin is unclear . 
