I think this it what you are looking for. Based off the bill, I originally thought duck. But looking at the neck it seemed to long for a duck so I went to goose. However, a goose's bill looks completely different which led me to swans. And from there I found this..
The Coscorobas Swan (South America). If you look at the photos further down, one has a caption of a nesting pair in the Florida swamps.http://www.avianweb.com/coscorobaswans.html
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~??76', ??80', AKL 06', BW 07', POR 08', ASMov 08', WL/SS 08', SS 09', AK-JH/DCL 09', ASMov 09', AK-KV 10', BLT/AK-KV 10', AK-KV 11', BLT 11', BW 12', DLR-GC 12', OKW/AK-JH 12', AK-KV 13', DCL 13', [OKW/BLT 13']