Im sure its just an old hen mallard but all basic indicators say a ross goose. Size, blue on the side of the bill, color but yet it seems odd. No barnacles or bill warts, neck seems really long. The bill meets the head in a straight line like a ross but seems more elongated than it should be. Maybe it's just a skinny juvy but it's almost like a snow and Ross cross. Seems shaped more like a duck. At any rate it's my first kill of 2020.