OK, I got the info....
Cut and paste from my mom's email....
TJ, These are Egyptian ducks. They are exotic ducks, escaped from a zoo or private collection. We don’t count them as a North American species – they don’t count on our bird list. We have some around Waco. There’s one at the Speigleville marina that has a white domestic duck for a girlfriend. They all hate him because he chases everyone – other ducks and also people and dogs.
--end cut and paste
She is a pretty major bird watcher. Does "bird counts" for the Audobaun society and ornothological (sp?)groups she is a part of.