Ok...this may seem stupid but do all species of ducks set up residence in suitable habitat? I ask because I was working at a customers home today and he has a large swamp with lots of vegetation in it. He also has automatic feeders for his domestic mallards. I was shocked to see over a dozen gwt as well as a dozen ringneck. I would have thought these birds would have been long gone. The landowner said the teal showed up in february and never left, and the ringneck go and come. I have never seen this and thought it strange. He said the teal had little ones but predators got them all.