Ringed teal

Back in August 2011 i was birding on my local patch i was taking photo's ,of tufted ducks when two ducks landed one in the middle of the lake one about ten feet from the bank i did take some pictues. but lost my sd card ,but the sd card has now turned up after going through the card i wasn't  sure at the time what duck it was but after doing some research The birds are Ringed Teals they come from South America they were probably escpees i think but i don't know.