I know that this time of year brings some new visitors (odd ducks) to Dykemans Spring so last weekend I went looking and found these guys. The first (pictures 1-3) I think, are mergansers. But I am not real confident of that diagnosis. The second is a Spotted Sandpiper. I've had that one confirmed. The biggest difference with these and the mallards and Canada geese it that the are a lot more skittish. Mergansers. What do you think?